Family Ties to One Life to Live

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

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

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

Alice & Trixie from The Honeymooners crossed over onto Hi Honey, I'm Home!

Here's Lucy's Lucy was driven around Miami by Ralph Cramden of The Hooneymooner's

Here's Lucy's Lucy Carter and Mannix's Mannix are held hostage in an episode of Here's Lucy.

Mannix returned to TV on an episode of Diagnosis Murder to solve an old unsolved case with the help of Dr Mark Sloan.

Diagnosis Murder's Dr Mark Sloan was defended by Matlock when Sloan was accused of murder

All My Children and Loving feature the fictional Trans Global Airlines

All My Children and One Life to Live crossed over a number of times