I have been binge watching Perry Mason on FETV the last few weeks. The show was on for 9 years, but they are not running them in sequence, so some of the guest stars are in shows back to back.
The best are when they are are a homicide victim in one episode, and the next one they are alive again and playing a police detective, or suspect, or some other role.
Or actors familiar from other roles turn up.
My favorites, when the guest star Neil Hamilton confessed to murder. You might recognize him as Commissioner Gordon on the Batman TV Series.
Or when Bernard Fox confessed to murder. You might recognize him as Dr. Bombay on Bewitched.
And Richard Anderson is a police investigator....you might recognize him as Oscar Goldman from the Bionic Man/Bionic Woman shows.
Or William Schallert. I think that guy was on every show at some point. Murderer, father, Smurf, cop, minister.....often a repeat guest in a different role.