[As we continue on to the next episode, April, Casey the Turtles and everyone we saw buried Splinter in April's farm, where the Kraang invasion started in season 3, pay their final respects at Splinter's grave. Then, one by one, everyone walks away excluding the four Turtles. Leo is the last one to leave.]
[Wandering alone in the woods near the farmhouse, Leo is calmly meditating at a riverbank. The wind whistles and then a voice speaks.]
Splinter's Spirit: Leonardo.
[Leo gasps, revealing that it was Splinter's Spirit.]
Splinter's Spirit: Do not fear me, my son.
Leo:[gasps] Splinter? Is it really you? Or am I dreaming this?
Splinter's Spirit: You are not dreaming. I have attained a higher spiritual plane of existence. Passing into death, we merge with the whole of life. We become one in all of nature, in all of the Universe. Even with you.
Leo: I.. I can't go on without you, Father.
Splinter's Spirit: You must, Leonardo. You are the sensei now. Your brothers need you. Karai needs you. Shredder is still alive.
Leo: What?
Splinter's Spirit: You must end this, Leonardo.
Leo: I don't know if we're strong enough, Sensei. Sensei? [He was gone.]
[As the wind whistles again, Leo watches some flower petals fly over his head and soar up towards the shining sun breaking through the clouds, before putting on his empty, white eyes, Leo decides to lead Hamato Clan and finish off their long feud with Shredder once and for all.]
[Theme song.]
[At the hospital, Karai is in the bed, recovers from suffered injuries, and awakens to see everyone.]
Mikey: Karai? Karai, are you awake?
Raph: Wow, you've seen better days, that's for sure.
[They stare angrily at Raph for teasing an injured Karai. In response, Donnie angrily elbows Raph's shoulder, much to his chagrin.]
Karai: I could take you, Raph, even with a broken arm.
Donnie: How you doing, Karai?
[Karai’s smile disappears and turns into a frown.]
Karai: [sadly] He's gone, isn't he?
[The turtles share glances and look down in great grief, reminiscing Splinter.]
Karai: I had a dream that Splinter's gone.
Leo: Yes, Karai, I'm so sorry.
Raph: We Karai, listen, um, Shredder is still alive. Slash told us that you know where his lair is.
Karai: I wanted to help bring him down.
Mikey: We need to know, Karai, before Super Shredder comes after you. Or April's dad. Or Casey's family.
Karai: It's twenty miles north of here. And Leo? Give Shredder a couple of hits from me.
[Karai smiles proudly at Leo, who smiles back. Leo puts his hand on hers. The dramatic music plays as everyone starts gearing up for battle. The turtles now wore their black shinobi masks on. Casey receives and made a new mask since his first one was smashed by the garbage truck. After the montage ends, Leo shows his brothers and friends the intel about Shredder’s mansion.]
Leo: Okay, based on Karai's intel, Shredder has a secret mansion in the middle of the woods right here. It's heavily fortified, and there are traps and Footbots everywhere. We'll have to keep on our toes.
Mikey: Some of us only have three toes, so, I hope that's cool.
Casey: Eh, five toes are way doper.
Mikey: What if we had six?
[Raph shoved Mikey out of the way.]
Raph: Let's take Shredder down.
All: Booyakasha!
[The Turtles and April at the Party Wagon, while Casey drives Hot Rod. The camera pans up to the moon, until the sky turns dark green, camera pans down, somewhere is Shredder's Mansion as our heroes arrive at the scene.]
Leo: This is it, team. Shredder's mansion is just beyond these woods. Be careful.
[They carefully sneak past as footbots appear. They began to attack them but they managed to defeat every one of them.]
Mikey: These things are a slice of cake and easy as pie. Mmm, so hungry.
Raph: Yeah, at this rate, we've got no problemo.
[The elite bots arrive.]
Donnie: One of us had to say something, didn't they?
[They run away from the bots as they stop at the edge of the roof. They get pushed right into the water with a splash.]
Mikey: Yes! Ah, nice. I love water!
[Fishface emerges]
Raph: Fishface!
Fishface: Do not call me that! Welcome, tartarugas. I will slap you like a salamander! I will fin you like a flounder! I will give you bass to mouth!
[Fishface dragged Raph in the water.]
Leo: After him!
[They swim down and battle the elite bots as Fishface attacks. Raph kicks Fishface out of the way and ends up getting hit. He gets trapped in a bubble by April and thrown to the surface. Raph emerges from the water.]
Fishface: You think you have the best of me? You are nothing, Raphae-
[Raph punches Fishface and attacks him in rage. Fishface attempts to kick him, but this time, Raph does not waste his time on this, and rips off his metal legs, causing to Fishface to shriek in pain. The others fight underwater and eventually defeat the Footbots. Raph pulled out Fishface’s breather. Everyone comes out, gasping for air.]
Fishface: You... dirty scoundrel!
[Raph rejoins the group. The teens begin to enter the mansion and into the bedroom. Shredder wasn't there, not even the bed, but they were met by Stockfly, who is up above the ceiling. They dodged his acid.]
Stockfly: Fools, there is nothing you can do against the Super Shredder! He is perfection itself. My boy Shredder is going to make you...
Mikey: Eat retro-mutagen, Buxton Bugbrain! [throws retro mutagen at Stockfly]
Stockfly: Bzz, it's Baxter, you- Huh? No, no, bzz, no!
[He cries out in pain as he falls behind the bed. Everyone watched as Stockfly slowly came out, as a human again,]
Stockman: I'm.. I'm human again? You turned me back?
Mikey: Yeah, dude! Are you happy or what?
Stockman: [angrily] You... JERK! I liked being a fly. Why do you think I never demutated myself? Sure, I was super disgusting, but I was smarter, faster, stronger. People liked me as a bug! You morons, I oughta-
[Just as Baxter began his threats, Mikey knocks him out with a single punch.]
Mikey: You're welcome.
Donnie: [enraged] Michel, that retro-mutagen was for Super Shredder. I only have one dose left now, thanks!
Mikey: Sorry, D. But he didn't even say thank you! How ungrateful can you be?
April: Super Shredder's close by. I can feel him. Let's make our way up.
[They head to the dojo.]
Bebop: Aww, look at this. They think they're entering the Dragon. Whoo-hoo! Yeah! Turtles be tripping! You seriously think you can sneak up in our house? This is our house!
Casey: Oh, great. Figures Bacon and Bonehead would be here.
Rocksteady: Hey, we are the Bebop and the Rocksteady, not the Bacons and the Bonehead!
Bebop: Shut up, Bonehead! Check it out, Turtles: our state-of-the-art super dope training facility. And guess what? It's programmed to eliminate freaky-deaky Turtles like you!
[The weapons come out of their hiding spot.]
Rocksteady: Da, and tiny teenage human friends.
[The others begin to dodge the lasers. Leo threw one of the ninja stars at the lasers as Raph stabbed the machines.]
Rocksteady: Let us crank the puppy up to eleven, shall we?
[April, Casey, Donnie and Mikey fell in the pit where saws buzzed right past them. Raph and Leo had to fight Rocksteady and Bebop. Raph jumped onto Rocksteady.]
Rocksteady: No fair! My ears be sensitive!
[The doors open to reveal sharped rolling spikes. Raph began to stab the machine to stop them. Bebop knocked him out of the way to restart the machine again. Out came where the spikes. Donnie gets past and cuts the chained balls and makes it out.]
Donnie: Gotta hack the system!
April: Can you hack a little faster, D?
Donnie: Almost got it.
[Bebop attempts to shoot Don, but Raph grabs him and furiously threw him to the ground. The machine finally stops and everyone comes back.]
Donnie: Yes! How about a little training session, B&R?
Bebop: Whoo-hoo, I'm outtie 5000. Ooh, sham on, sham on.
[Donnie activates the machine on teh two goons. They fire the lasers at them. Later, they entered the next room where they encountered Tiger Claw. He now has a robotic hand replacing his sliced arm from the last episode.]
Raph: Wow, Tiger Claw! Liking the new steel paw look. Pretty cool!
Tiger Claw: [walking menacingly while putting one hand behind his back.] Do not mock me, Turtle. As punishment, I'll take all of your hands.
Leo: Turtles attack!
[Tiger Claw retreats to the weapon holder and inserts his prosthetic hand into the hole pulling out his blade like hand claws. Leo and Raph exchange blows as Tiger Claw blocks them with both his machete and his prosthetic hand blade. Both Leo, Raph and Tiger Claw are put into a blade block.]
Tiger Claw:[Smugly.] Do you feel it, boy? The weight of the world crushing you, now that your sensei is gone?
Leo: You dirty cat!
[Filled with rage, Leo yells, grabs his second sword hilt, and then decapitates Tiger Claw’s mechanical hand. Leo pressed on Tiger Claw before disarming T.C's machete.]
Leo:[Pointing his katana at T.C.] You just used your ninth life, pussy cat!
[T.C smirked as he triggered a button which made the hatch open and the teens fell. They soon came face to face with tigers.]
Tiger Claw: Beautiful, are they not? A tiger can eat 50 pounds of meat in a night.
[They run away.]
Raph: April, some kind of mind-thingy?
April: Yeah, good call.
[She levitates them into the air]
April: I can't hold it any longer, guys!
[They fall Leo used his arrow and stuck T.C's jetpack.]
Tiger Claw: What! My rocket!
[He fell into the water as the turtles made it on the roof. There, Leo sees Shredder on the rooftop.]
Leo: Shredder!
[He sets the house on mansion on fire, separating April and Casey away from the turtles.]
Casey: Aww, no!
[The turtles look up as Super Shredder walks away from them.]
Raph: Let's finish this.
[They climb to the top of the rooftop. Lighting bolt flashes from the background.]
[Shredder's mansion is now on fire. As Super Shredder Walks toward the building's door, he stopped sensing Leo from behind.]
Leo: Your time is up, Shredder!
Super Shredder:[Closing his eyes nonchalantly.] I was wrong. [Opened his eyes.] I thought after the death of your master that you would flee from the city as you did before. Afraid to face me. [Super Shredder turned his whole body to face Leo before the rest of the turtles landed flanking Leo on each side.] Afraid to embrace your fate.
Raph:[Spinning his sai.] Don't flatter yourself, Freak-Nut.
Mikey: Yeah! You're not so tough, Cheese Grater! We got you.
Donnie: Tonight, it ends! [Donnie raised his Naginata.]
[Shredder growls as he removes his cape and the final battle begins.. The turtles begin to battle him with every move they got. Shredder blocks and then gets kicked in the face falling over the other side of the mansion rooftop. Shredder halt's Raph's attempt to stab him then pushed him to the fence. Shredder tries to swipe at Raph but ends up making a hole in the fence. He dodges the incoming stab strike from Leo. The fight continues with the Turtles and Shredder exchanging and blocking blows. When Shredder tossed Donnie through the fence. Donnie bounces back at Shredder causing him to loose his footing. As Mikey trips the Shredder, Leo and Raph use Mikey's chain to tie up Shredder to incapacitate him.]
Mikey: Donnie!
[Mikey tosses him his bo and Donine catches it and aims for Shredder’s heart. As Donnie furiously yells to finish the Shredder off, the villain clamps the blade with his hands. Then in an attempt for the blade to cut through Shredder, Donnie throws the retro mutagen at his chest. While it does blindside him, the mutagen has no effect somehow and Shredder knocks down Mikey in response]
Donnie: The retro-mutagen has no effect!
[Donnie tries to reach out for Mikey, but dodges Shredder's strike. Donnie lands on the fences, but Super Shredder sweep kick it causing him to be thrown overboard. Luckily, Donnie is caught by April]
April: Gotcha, D!
Donnie: Thanks, April. Better get back up there.
April: Hold up, D. The fire's getting out of control! And I don't have the strength to levitate you.
[Donnie’s only thing to do is to watch what is happening up there, with great concern over the safety of his brothers. The three remaining turtles fight as Raph gets body slammed by Shredder]
Super Shredder: Pathetic! [throws Raph into the doorway] Redundant!
[Super Shredder heard a noise and turn around facing Mikey. As the turtle attacks Super Shredder, the bladed mutant dodges it, grabs one of Mikey's nunchucks, and whacks him on the air vent before kicks Mikey off.]
Raph: I'm done with you, ya metal freak!
[He attacks and hurls shredder causing them to fall from the stair way. Shredder grabs Raph, but misses raph when trying to swipe with his claws. Shredder knee strikes Raph, grabs him and attempted to hurl into a brick wall, but was incapacitated by raph hurling him into the brick hole and pipe. Raph slamming his head down multiple times until he goes limp. Thinking that he’s finally dead, Raph smiles in relief, however…]
Super Shredder: Fool!
[Shredder attempts to behead Raph, but by a mere second, Leo comes through and attempts to block it. Instead, he’s backhanded into a wall and Shredder kicks Raph through the fence hole and he falls off the building, leaving Leo the last turtle standing on the rooftop.]
[The flames are now more intense than ever, Leo retreats to the other side of the building anticipating Shredder’s arrival. The aforementioned nemesis jumps to kill Leo, but he blocks his attack with his katanas]
Leo: [Angrily and Hurt] You killed him. He was your brother, and you killed him!
[Leo stuck a nerve in Super Shredder, causing him to be shocked and then triggered at what Leo said to him. In retaliation, Super Shredder pushes Leo's twin katana aside and kick him in the stomach. Leo recovers from the kick.]
Leo: [Side steps as Super Shredder follows along.] He was your brother, Saki. Your best friend! How could you do that?!
[Leo back jump toward the mansion's air vent. Super Shredder charges at Leo and kicked the air vent where leo is standing on and back kicks Leo toward the other air vent. Leo recovers attempting to slash Super Shredder but misses. Super Shredder stomps Leo but also misses. Leo jumps midair slashing Super Shredder's face.]
Super Shredder: Splinter was cursed to become a loathsome rat! [Grabs' Leo in midair pinning him on the air-vents then slamming him to the ground causing one of his katana to lodge on the ground.] It was his fate! His destiny!
Leo: You're a monster! A demon! Is that your destiny?!
Super Shredder:[Displayed a shock expression and then looked at himself for what he has become.] No, I- I'm-
[Super Shredder drops his right arm down feeling remorse and regret for what his quest for vengeance lead him to. Leo attempted to stab Super Shredder while his guard is down. Super Shredder notices it at the last minute, grabbing Leo's arm and cracking the terrapin's arm in retaliation causing Leo to scream in agony and drop his second katana into a pit.]
[Super Shredder flings Leo by punching him in the stomach causing him to roll over to the edge of the burning building. Shredder walked up to the injured turtle, now seething in anger knowing that killing Splinter is not enough.]
Super Shredder: And now.. you DIE.
Splinter:[off screen.] Leonardo...[Walk through the flames behind Super Shredder.] fear nothing.
[Leo's eyes become white and he finally dodges the attack. Finally, no longer being weak, he furiously gives him a serious beatdown by kicking him numerous times. Super Shredder stumbles from Leo's last jump kick as Leo from behind kick Super Shredder's back leg joints causing him to collapse.]
Super Shredder: Raaaahhhhgh!
[Leo leaps back and sucker punches Super Shredder's face before retrieving his katana lodged on the building's floor and pulls it out. With a final enraged shriek, he delivers a powerful fatal strike at Super Shredder.]
[We fade out to the bottom of the cliff where the rest of the teens had gotten away and watch the mansion burn into ashes.]
Casey: I can't believe it.
April: Leo!
Raph: [voice breaking] He's gone?
Mikey: No. No, he can't be!
[Leo walked on the cliff's edge holding something.]
Mikey: Leo!
Raph: Brother!
[Leo showed his brothers, April, and Casey the lifeless helmet of Shredder.]
Leo: Shredder...[Dropped the broken helmet down.] is finished.
[The severed broken helmet lands on the ground, the end of Shredder's life is over. Later on, Karai was on the Rooftops until Leo came.]
Leo: Karai, I'm so sorry.
Karai: There's nothing to be sorry about, Leo. I just wanted to thank you for finishing what no one else could.
[His brothers approach.]
Raph: You did it, brother. You ended the Shredder.
Leo: Nn! Okay, okay, don't squeeze me so hard, Raph. I'm still recovering.
Donnie: So what are we gonna do next?
April: Oh, I'm sure there'll be plenty of enemies willing to take Shredder's place.
Casey: Tiger Claw's still out there. The Foot Clan isn't out of the game yet, dudes.
Mikey: Whatever evil emerges, we'll be ready 'cause we're awesome!
Leo: That's right, Mikey. And we'll do it together. Right, Sensei?
[The New Hamato Clan gaze up at the sky. The season 4 finale ends, and with that, Splinter will be in their hearts...forever.]