Back to the Future: The Animated Series episode "Solar Sailors" is set on December 15 of this year.

In the Superman: The Animated Series episode Absolute Power, a black hole acts as a major plot device.

Lightray appears in the Superman: The Animated Series episode "Legacy" Pt.

Mad Hatter also makes an appearance in the Superman: The Animated Series episode "Knight Time."

There is an example in the Star Trek: The Animated Series episode "The Slaver Weapon".

Stick is depicted in an episode of Spider-Man: The Animated Series episode "Framed".

It was the basis of the Star Trek: The Animated Series episode, "The Slaver Weapon".

Zabu also appeared in the 1990s X-Men: The Animated Series episode "Reunions."

Starro makes a cameo appearance in the Superman: The Animated Series episode "The Main Man."

Krona appears in Green Lantern: The Animated Series episode "Loss."