I'm glad you are enjoying the audio postings Jim. I still have a few more Carroll/Culp theater adaptations to go and many many more location audio tapes. I should have a new installment within the week (or fortnight).
In my mind there is a slender thread connecting Chekhov with I Spy. We have the Vanya recording with Culp as Uncle Vanya. In 1991 I saw a performance of "Three Sisters" at the La Jolla Playhouse with two-time I Spy alumnus Michael Constantine (also Jon Lovitz!). And in 1990, at the same venue, "The Cherry Orchard" with Robert Cornthwaite (and Lynn Redgrave!) who was never in I Spy, but as Tatia has pointed out, was in two Trackdowns and one of The Name of the Game episodes in which Robert Culp starred. He earned his pop-culture spurs (and a spot in the Science Fiction Hall of Fame) playing the prickly Dr. Carrington in "The Thing from Another World" (which starred Ken "Russ Conway" Tobey and was directed by prolific I Spy director Christian Nyby).