Batman to Leave it to Beaver
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Batman
Hogan's Heroes
Hogan's Heroes Colonel Klink has an explicable but existent cameo in an episode of the 1960s live action Batman
Green Acres
Green Acres' Oliver Wendell Douglas was briefly a prisoner in Stalag 13 where he contacted Hogan's Heroes' Colonel Hogan
The Beverly Hillbillies
Petticoat Junction was a spin-off of The Beverly Hillbillies. Petticoat Junction spun off Green Acres. All three shows crossed over numerous times.
Mister Ed
The Beverly Hillibillies? Granny appeared on an episode of Mister Ed (see below for more on The Beverly
Hi Honey, I'm Home!
Hi Honey, I'm Home!'s Lloyd was friends with Mister Ed
Leave it to Beaver
Leave it to Beaver's June Cleaver crossed over onto Hi Honey, I'm Home!