George & Harold in The Loud House: The Batman/TMNT Adventure

George & Harold in The Loud House: The Batman/TMNT Adventure is a 2018 digitally-animated 2D action-comedy released by Warner Bros. Feature Animation and Nickelodeon Movies. The film is a four-way crossover between The Loud House, Teenage Mutant Ninja Turtles, Captain Underpants, and Batman: The Animated Series, though it is based on the 6-issue miniseries Batman/Teenage Mutant Ninja Turtles Adventures.
== Voice cast ==
Voice Actor 	Character
Daryl Sabara 	Lincoln J. Loud
Keith J. Ferguson 	Harold Hutchins, Upgrade
Kevin Michael Richardson 	George Beard, Oroku Saki/The Shredder
Eden Sher (some scenes)/Liliana Mumy (regular) 	Leni Loud
Jamie Marchi 	Lori Loud
Catherine Taber 	April O'Neil
Bumper Robinson 	Clyde McBride
Monica Rial (regular)/Kate Micucci (some scenes)	Luan Loud
Lara J. Miller 	Lisa Loud
Grey Griffin 	Lola Loud
Laura Bailey 	Lana Loud
Kara Edwards 	Lily Loud
Dante Basco 	Omnitrix/'Omni'
Zach T. Eisen 	Nemetrix/'Nemmy'
Debi Derryberry 	Lucy Loud
Kari Wahlgren 	Maggie
Ben Diskin 	Leonardo
Charlie Schlatter 	Donatello, Feedback
Scott D. Menville 	Raphael
Jaleel White 	Michelangelo/Turtle Titan, Bumblebee/Goldbug, Blitzwing (Icy, Random)
Jess Harnell 	Blitzwing (Hothead)
Travis Willingham 	Arnold "Casey" Jones
Cree Summer 	Angel Jones
Hoon Lee 	Master Splinter/Hamato Yoshi
Mark Hamill 	Jack Napier/The Joker
Loren Lester 	Dick Grayson/Robin I/Nightwing
Max Charles 	Timothy "Tim" Drake/Robin II
Tara Strong 	Barbara Gordon/Batgirl, Sari Sumdac
Kevin Conroy 	The Batman/Bruce Wayne
Quinton Flynn, Greg Ayres (some scenes) 	Bat-Mite
Eric Bauza 	Tiger Claw
Kelly Hu 	Oroku Karai/Hamato Miwa
Gwendoline Yao 	Shinigami
Christopher Lloyd 	Ch'rell
Tevin Campbell 	Anton Zeck/Bebop
David Ogden Stiers 	Ivan Steranko/Rocksteady
Clancy Brown 	Chris Bradford/Rahzar
Christian Lanz 	Xever/Fishface
Jim Ward 	Diamondhead
Richard "Rick" McGonagle 	Four-Arms
Justin Cook 	Ghostfreak
Maurice LaMarche 	Heatblast
Richard Moll 	Two-Face
David Kaufman 	Overflow
Ryan Drummond 	XLR8
Dorian Harewood 	Cannonbolt
Patrick Fraley 	Upchuck
Danny Jacobs 	Snakeweed/Snake Weedelman
Roger C. Smith 	Timothy/Pulverizer/ Mutagen Man
Hynden Walch 	Harley Quinn
Michelle Ruff 	Pamela Isley/Poison Ivy
Phil LaMarr 	Baxter Stockman/Buzzkill
Kevin Eastman 	Klunk/Ice Cream Kitty
Greg Ellis 	Jervis Tetch/Mad Hatter
Ron Perlman 	Roland Daggett/Clayface
Jeffrey Combs 	The Scarecrow/Jonathan Crane
Additional voices include Jeff Bergman, Rob Paulsen, Tom Kane, and Jill Talley. 
== Plot ==
The film begins with Harold being driven back to the Louds' neighborhood by Bumblebee and Sari Sumdac, following a battle against Headmaster (who apparently returned a FOURTH time). However, due to misreading the situation (when Sari gave Harold a quick kiss on the cheek as he got out of Bumblebee), Maggie (the emo teen from "Funny Business") whacks him in the head with a baseball bat, which results in Harold screaming a series of angry curses at her, though Luan manages to clear things up between them, leaving behind plenty of lingering awkwardness.
Later, in Manhattan, Turtle Titan (Michelangelo) attempts to intimidate a bank robber, who passes out afterward. Back at the Lair (where the Loud siblings and Clyde have gathered), Leo is lecturing Mike that they can't allow themselves to be seen, when Donnie's laptop picks up a portal signal, meaning only one possible thing—the Kraang have somehow returned...
While staking out the sewers, the team encounters Clayface, who's all-fired-up and pissed as hell. After a brief battle, Donnie forces him through a portal by blasting him with a storm drain.
Meanwhile, Batman's archenemy, the Joker, and his gun-moll Harley Quinn, have recently escaped Arkham Asylum and encountered Shredder, Bebop, Rocksteady, and Ch'rell. After Joker explains his story, Shredder orders Bebop and Rocksteady to deal with their unwanted guests, but Joker quickly stuns them with an explosive rubber chicken. Ch'rell, in a makeshift exosuit, makes short work of the Clown Prince of Crime and advises Harley that this was just a warning and that next time Joker steps out of line, he won't be so lenient.
In Central Park, the team discovers another portal, from which Batman, Robin, and Batgirl emerge. Mistaking them for Dimension X mutants, the team attacks and a battle begins. Eventually, Bat-Mite appears and breaks up the fight by explaining that they are all on the same side. Any further competition is cut short when the team discovers Snakeweed and Poison Ivy, wreaking havoc on unsuspecting joggers.
While the others keep Snakeweed and Ivy at bay, Harold transforms into Grey Matter and constructs a "retromutagen grenade", which he throws at Snakeweed, changing him back into his human form, Snake Weedelman, who falls unconscious after his de-mutation.