Girlfriends to Hangin' with Mr Cooper

Dorian from Moesha appeared on episode of Girlfriends with Girlfriends' character Maya who later returned the favor and appeared in a episode of Moesha.

Hakeem and Niecy from Moesha went to the prom with Cher and Sean from Clueless.

Sabrina from Sabrina the Teenage Witch visited Cher from Clueless in the episode "Mr. Wright."

Sabrina the Teenage Witch also crossed over with Boy Meets World on several other occasions.

Boy Meets World and Step by Step both had episodes at Disney World and whiel in Disney World Eric from Boy Meets World met Dana from Step by Step.

The family from Step by Step was in the middle of a barbeque outside when Urkel from Family Matters came (literally) crashing in on the jetpack he had built on the last episode of Family Matters.

Steve Urkel visited Stephanie Tanner of Full House to convince her that glasses could be cool

Michelle Tanner from Full House appeared on an episode of Hangin' With Mr. Cooper in which Mr. Cooper was her substitute teacher.