Gauntlet of Doom

Superman and Batman team up to take down some sort of menace... alien twins who may or may not be from the comics.  They definitely aren't from the cartoon shows.

Given that Superman is super-humanly strong and nearly invincible, it seems a little unfair to make Batman fight polar bears.

Help Batman punch polar bears @ Toonami: Lost Data

(Superman could probably squash these into red paste.)

Use the Bat-computer @ Toonami: Lost Data

(Superman does not think highly of Bruce's Bat-computer.)

It's not necessary to play every episode of the game.  Nothing is shared between them.  The choice of hero doesn't even seem to matter.