Its 3:00 am at night, and the turtles, April, Casey, Splinter and Karai are sound asleep in the lair. Suddenly, Splinter wakes up as he always does at this time of the night, to perform his nightly meditation routine. Splinter quietly sits under the shade of the tree that as grown in the lair, and peacefully sits in a lotus position as he contemplates the events that have recently occurred, from Karai re-uniting with him, to the Shredder finally being defeated and going into hiding.
"Father, is everything okay?" Karai says, noticing that her father had awoken in the dead of night.
"Yes my daughter, everything is going well. I am just performing my nightly meditation" Splinter responds, with a smile on his face upon seeing his daughter. Karai takes a minute or so to respond, but then asks her father and new sensei:
"Can I meditate too?"
"Of course Miwa" Splinter heart-warmingly says, changing his position and making his space for Karai, who approaches her spot and quietly sits in a meditative lotus position.
Karai contemplates the beauty of the nocturnal silence and gently handles her breath, before suddenly looking discomforted.
"Miwa, is everything alright?" Splinter says, recognizing that Karai was clearly still troubled by something.
"Yes father, it's just that, I feel like I've missed out on so much during all those years. Shredder didn't teach me to meditate, to be at peace with myself, to do whats right. All I have been taught were lies about what you did and to crave revenge."
Splinter contemplates upon these words for a minute, before suddenly hugging Karai, surprising her.
"I am truly sorry for all of your losses, Miwa. I genuinely want you to find peace within yourself and have a better future." Splinter said with a warm smile on his face.
Karai realized, that although words were insufficient to convey feelings, that her father truly cared for her, and had the best of intentions for her, thus she could always express how she felt, something she oftentimes did not do under the care of the Shredder, whose wrath she often feared despite truly caring for him at one point in time.
"Thank you father" Karai replied, with a warm and peaceful smile on her face.
Karai and Splinter both peacefully meditate in the lair for a good 10-15 minutes, before suddenly….
They both heard a thundering roar from above as the screams of people and the falling of buildings replaced the nocturnal silence. Almost immediately, the Turtles, April O'Neil and Casey Jones awoke from the chaotic sounds and immediately ran towards their sensei and adoptive sister.
"What on Earth could make that sound!? The Triceratons?!" Raph angrily snarled as his deep sleep was interrupted by another crime fighting mission after months of non-violence.
"Whatever it is, we need to go and investigate Ninjas." Leo said in response. Splinter nods in agreement before giving his instructions to Leonardo:
"My sons, you should go with April and Casey to investigate the source of chaos. Me and Karai will go and get some assistance to help us with our mission"
"Aye, Sensei" Leonardo signals to Splinter as he, his brothers, April and Casey leave the lair to see just what is causing all the chaos.
The gang of 6 lift up a manhole cover and are shocked by what they see, a large battle fortress on the ground wreaking havoc on the city, crushing everything in its path.
"Holy Pepperoni!" Mikey instantly shouts, seeing the giant monster devour whatever is in its way. It fires lasers using its cannons, and its one Eye at the top watches everything as the buildings collapse from the impact.
"Looks like a mobile battle fortress that is being controlled by someone from the inside. This is bad guys; the machine's size has the potential to carry an entire army inside!" Donnie says as he is freaking out over all the destruction being caused "Any plans Leo?" Leonardo nods in agreement and then informs the team of his plan:
"I've got one ninjas; we should break into the fortress and sneak up on whoever is controlling it, and if that fails, we should atleast be able to know who we are fighting."
"Well Come On! We don't have all day!" Raph angrily says as he is the first one to emerge up onto the streets, followed by his brothers, April and Casey. They look at the giant fortress for a while, before suddenly seeing an army coming out of it and littering the streets of New York City. The army consists of robots wearing ninja-esque clothing, followed by brown and white men appearing to be made of stone. Both sets of soldiers carry lazer blasters and quickly start putting people to their knees and rounding them up as they continue to invade and occupy every corner of the streets. In response, Casey puts on his hockey mask and makes a remark as he gets ready to take on the robots and prepares his weapons:
"Looks like it's time for Casey Jones to finally kick butt"
"No Casey! Don't!" April shouts as Casey approaches about 2 robots that get ready to attack, but before they can cause any injury, Casey easily destroys them by bashing his hockey stick straight into their robotic torsos.
"Double kill" Casey smugly says as the robots lay on the ground, easily destroyed by one swing of his main weapon.
"Wow, that was actually pretty easy" Raph replies as he stabs his Sai straight into the face of another robotic foot soldier.
"You know dudes; these robots sure remind me of the foot bots we used to fight. Only easier to kick out of their shells haha" Mikey says as he smashes another foot soldier.
"Umm. Guys, we have company!" Donnie exclaims as the turtles, April and Casey see a number of stone warriors charge towards them.
"Attack with everything you've got!" Leo exclaims to his team as they charge for the rock soldiers, led by a brown coloured general wearing a green helmet.
"Get the turtles!" Shouts General Traag as the turtles, April and Casey clash against the multitude of stone warriors. The turtles are then pretty quickly outclassed as their weapons have absolutely no effect on the rock hard armour that they try to harm, only receiving blows from the stone warriors and getting knocked out in battle.
"There's too many of them Raph!" Casey Jones exclaims as General Traag picks him up with one arm and easily throws him into the other turtles and April.
"Retreat Ninjas!" Leo shouts as he throws a smoke bomb in order to disguise their escape. The turtles, April and Casey are then hiding in an alley as the rock soldiers desperately search for them, but to no avail.
"This is great! First the Kraang, then the Triceratons and now these Rock heads!" Raph angrily says as the others tell him to keep it down in order to avoid capture. Leonardo suddenly then hears his T-Phone ringing and quickly answers it:
"Yes Master Splinter"
"My son, I and Karai have regrouped with the Mutanimals in the lair, and we have info about the invaders"
"On it Sensei, We'll be there ASAP!"
Splinter then hangs up the cheese phone and the group of six secretly sneak back into the sewers, while the foot and rock soldiers are still searching for them in the streets. They make their way into the lair, to see Splinter, Karai, the Mighty Mutanimals and Jack Kurtzman waiting for them.
"Glad to see you've come, Raph" Slash says as Raphael enthusiastically replies to him:
"No problem Slash old buddy,"
"I'm glad to see you're safe Michelangelo" Leatherhead says in a gentle tone as Michelangelo hugs him.
"So Mr. Kurtzman, what have you found out about that huge battle fortress?" April asks him. Kurtzman replies:
"Well, according to what I have known about the Kraang through investigation, the battle fortress currently invading our city is a technodrome that is owned by an Utrom, who was a part of the Kraang before he was banished by Kraang Prime and Subprime for betraying their orders."
"That sounds really familiar, a Kraang who was banished? Didn't we encounter him sometime during our time in space?" Donatello wonders and then figures out who it was: "Of Course! That's it! He was Krang, the Utrom who was banished to Two-Dimensional Earth, where our dimensional counterparts live!"
"Since those turtles know a lot more about him than we do, we should be asking them for help" Leonardo suggests. "But if only we had a way to contact them!"
"Well, my portal projector only has a prototype but it might just work," Donnie says in response, when suddenly, our heroes suddenly feel the ground shaking from the impact of the technodrome.
"Well Donnie! If there is any time to use it is now!" Raph angrily snarls at him as the shaking continues and then stops, before Splinter makes his final statement:
"Go my sons. Take April and Casey with you while I, Karai and the Mutanimals will try and weaken the invasion force."
"Come on, work!" Donatello desperately tries to get his portal ray to work when suddenly, its emits a beam of light into a wall and they see the 2D universe behind a portal. "Yes!"
The Turtles, April and Casey all cheer and then make their way through the portal, after bowing down to their sensei.
"Goodbye Master Splinter" Leonardo says with a slightly sad tone in his voice.
"Take care my sons"
The Turtles jump into the portal as Mikey excitedly yells:
"Booyakasha!"