Our pretend detective Jessica Fletcher gets a visit from a real (television) detective, Lennie Briscoe. Also featuring Lt. Commander McHale from the Navy, Geordi La Forge from space, a hopeful Dr. Kleema from Chicago, and the frickin’ Batman. Truly one of the most epic nights in television history.
from TV Guide in 1987; episode: Death Takes A Dive (season 3, episode 16)
The absolute king of the surprising guest star series would have to be Gunsmoke, a Western that was only recently overtaken as the longest-running drama series on television.
You turn it on, and you might see…hey, Leonard Nimoy as an Indian:
Lyle Waggoner screen tested for the role of Batman in the sixties TV show. It was down to him and Adam West. He did fine, but I think his instincts were to underplay, let the costume do the work, when he should have “gone big.”