Thomas and Twilight Sparkle's Adventures of The Terminator III: Rise of the Machines is the fourth upcoming Thomas/MLP/Terminator crossover and sequel to Thomas and Twilight Sparkle's Adventures of Terminator 3: Rise of the Machines to be created by Stuingtion.
In 2003, Dr. Serena Kogan (Carter) of Cyberdyne Systems convinces death row inmate Marcus Wright (Worthington) to sign over his body for medical research following his execution. Sometime later, the automated Skynet system is activated, becomes self-aware, begins to perceive humans as a threat, and eradicates much of humanity with nuclear weapons in the event known as "Judgment Day".
In 2018, John Connor (Bale) leads an attack on a Skynet base, where he discovers human prisoners and schematics for a new type of Terminator, incorporating living tissue, the T-800. Connor survives a violent assault on the base, which is later destroyed in a nuclear explosion. Following Connor's departure, Wright emerges from the base's wreckage and begins walking towards Los Angeles.
Connor returns to the Resistance headquarters located aboard a nuclear submarine, and is briefed by General Ashdown (Ironside). The Resistance has discovered a hidden signal containing a code protocol which they believed could initiate a permanent shutdown of Skynet's machines. Working on this intelligence, the human militia plan to launch an offensive against the Skynet base in San Francisco. It is decided among the Resistance that the offensive will commence in four days, due to an intercepted kill-list created by Skynet, which plans to terminate the Resistance's command staff within the same time frame. Connor learns he is second on this list, following Kyle Reese (Yelchin). The Resistance leaders are unaware of Reese's importance, but Connor knows Reese will eventually travel back in time and become his father.
Arriving at the ruins of Los Angeles , Wright encounters Reese and a mute child named Star (Berry) during a violent skirmish with Terminators. Reese and Star are subsequently abducted and taken prisoner by Skynet. Later, two Resistance A-10 airplanes are shot down while trying to intercept a machine transport. Wright locates downed pilot Blair Williams (Bloodgood), as they make their way to Connor's base, where thereafter, Wright is wounded by a magnetic land mine. Attempting to save his life, the Resistance fighters discover that Wright is indeed a cyborg, with a mechanical endoskeleton and a partially artificial cerebral cortex. Although Wright believes himself to be human, Connor thinks that Wright has been sent to execute him and orders him to be killed. Williams helps Wright escape. During the pursuit, Wright saves Connor's life from Skynet's hydrobots and the two make a bargain; Wright will enter Skynet's headquarters in San Francisco, to help Connor rescue Reese and the other prisoners, if he lets him live.
Connor pleads with General Ashdown to delay the offensive so he can formulate a plan to extract the human captives, but Ashdown refuses and relieves Connor of his command. However, the Resistance disobey Ashdown's orders and instead, await Connor's signal. Wright enters the base, interfaces with the computer, and disables perimeter defenses so that Connor can infiltrate the cellblock and release human prisoners. Wright learns from Skynet (which assumes the form of Dr. Kogan on a screen), that he was created and built to lure Connor to the base; when the Resistance launches its attack, Connor will be killed, achieving the goal that Skynet had failed to accomplish in the past. The hidden signal that the Resistance received earlier is revealed to have been a ruse, and Skynet uses it to track down and destroy the command submarine with the Resistance's leaders aboard.
Wright tears out the hardware linking him to Skynet and assists Connor in battling the new T-800 (Model 101) Terminator (Kickinger). Wright is soon outclassed in strength and temporarily disabled until Connor comes to his aid. Wright eventually defeats the T-800 while Connor destroys the Skynet base by rigging together explosives. Connor, Wright, Reese, and Star are airlifted out. Connor though was seriously wounded during the assault with a life threatening injury to his heart. Wright offers his own heart for transplantation, sacrificing himself to save Connor. Recovering, Connor radios to other Resistance fighters that, although this battle has been won, the war is still not over.
- Stephen, Zecora, Button Mash, Daring Do, Steamy, Puffy, Evan, Shai-Shay, Rattlesnake Jake, Mako, Willy, Sharky, T.C., Hugs, Sherin, Marshall P.F., General Dedrich, The Miner Trains, The Planet Trains, J.J., Buzz, Anna, Elsa, Lazlo, Raj, Clam, Ed, Edd n', Eddy, The Powerpuff Girls (Blossom, Bubbles, and Buttercup), Blythe Baxter, Zoe Trent, Pepper Clark, Penny Ling, Vinnie Terrio, Sunil Nevla, Minka Mark, Russell Ferguson, Buttercream Sunday, Gail Trent, Mitzi, Sugar Sprinkles, SpongeBob SquarePants, Patrick Star, Squidward Tentacles, Sandy Cheeks, Mr. Krabs, Dudley Puppy, Kitty Katswell, Jenny Wakeman, Danny Phantom, Dusty Crophopper, Princess Celestia, Princess Luna, Optimus Prime, Bumblebee, Ironhide, Ratchet, Dino, Sideswipe, Skids & Mudflap, The Wreakers, Arcee, Wheelie, and Brains guest star in this film.
- The Storyline continues in Thomas and Twilight Sparkle's Adventures of Terminator: Genisys.