I'll have to check that. Ted Knight certainly did a lot of work for Filmation (including that bit of amateur theatre in '66 to convince the execs at DC Comics that they were a real animation studio when the entire staff consisted of Lou Scheimer, Norm Prescott, and, I kid you not, the mannikin at the receptionist desk; either the group they brought in was really good, or the guy from DC was an idiot, because it worked and they got the nod for "Superman").
If it's true, it's at least worth a mention in the update to the Concordance...