Animaniacs

A humorous cartoon series produced by Steven Spielberg for Warner Bros, Animaniacs was broken into segments starring a variety of characters, though they crossed over into one another's segments on a not infrequent basis. The main characters were the Warner Brothers (and sister), Yakko, Wacko and Dot. Laboratory mice Pinky and the Brain were later spun off into their own cartoon.

Connections IN Animaniacs
DC Universe In the Animaniacs sequence A Midsummer Night's Dream, Batman and Robin turn up in the Batmobile to rescue Wakko, Yakko and Dot from an angry fairy.

Connections TO Animaniacs
Freakazoid Wakko and Brain both turned up in Freakazoid to argue with him about who was Steven's favorite.