The Rain Drain (1966)

After The Daily Planet receives a letter from a mad scientist threatening to wreak destruction with his Electrothanasia Ray, Lois Lane heads out in the hopes of getting more information for a news story.

Batman, Batgirl, and Robin forge an alliance with the Teenage Mutant Ninja Turtles to fight against the Turtles' sworn enemy, The Shredder, who has apparently teamed up with Ra's Al Ghul and The League of Assassins.

In an alternate universe, very different versions of DC's Trinity fight against the government after they are framed for an embassy bombing.

Mr. Freeze turns Killer Croc and Bane into super-sized monsters, and they bash their way through downtown Gotham until the Caped Crusader and his team of heroes join the fight in their giant robot mechs.

The assassin Deathstroke tries to save his family from the wrath of H.I.V.E. and the murderous Jackal.

A cliché hunchbacked evil scientist's assistant aspires to become a scientist himself, much to the displeasure of the rest of the evil science community.

After a high school lab experiment goes horribly wrong, Mordecai and Rigby must go back in time to battle an evil volleyball coach in order to save the universe — and their friendship.

When Batman goes missing, it takes the entire Bat "family" - including Batwoman and Batwing - to keep the peace in Gotham and unravel the mystery behind the Dark Knight's disappearance.

Cartman locks horns with his mom in a battle of wills while an epic conflict unfolds that threatens South Park’s very existence.

Phineas and Ferb travel across the galaxy to rescue their older sister Candace, who has been abducted by aliens and taken to a utopia in a far-off planet, free of her pesky little brothers.