Loving to The Andy Griffith Show

All My Children and Loving crossed over a number of times.

All My Children and Loving feature the fictional Trans Global Airlines

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

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

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

Make Room for Grandaddy's Williams had Here's Lucy's Lucy Carter as a houseguest

The Danny Thomas Show came back as Make Room For Granddaddy

Danny Thomas Show spun off The Andy Griffith Show after Danny Williams got arrested in Mayberry.