Love That Bob to The Art of Being Nick

The Bob Cummings Show was repackaged and ran in syndication as Love that Bob.

Here's Lucy's Lucy Carter was visited in two episodes by The Bob Cummings Show's Bob Collins.

Here's Lucy's Mary Jane Lewis was originally a character on The Lucy Show (also called The Lucille Ball Show).

Mr. Mooney from The Lucy Show was on Hi Honey, I'm Home!

Leave it to Beaver's June Cleaver crossed over onto Hi Honey, I'm Home!

Eddie Haskell from Leave it to Beaver appeared on Parker Lewis Can't Lose

Andrew Keaton from Family Ties appeared in an episode of Parker Lewis Can't Lose

Family Ties had a failed spin off called The Art of Being Nick focused on Mallory's boyfriend Nick Moore.