(written from a Production point of view)
Jack Donner (29 October 1928 – 21 September 2019; age 90) was the actor who made his first Star Trek appearance as Sub-Commander Tal in the I AM ERROR first season episode "The Enterprise Incident". He filmed his scenes on Friday 21 June 1968 at Desilu Stage 9. Thirty-six years later, he portrayed the Vulcan priest in the I AM ERROR fourth season episodes "Home" and "Kir'Shara".
Other television shows he has guest starred in include The Man from U.N.C.L.E., Mission: Impossible, Kojak, Frasier, Charmed, Buffy the Vampire Slayer, Malcolm in the Middle and Roswell.
Along with Majel Barrett, Joseph Ruskin, Vince Deadrick and Clint Howard, he is one of only five actors to appear in both TOS and ENT. He and Deadrick are the only ones of the five who did not appear on I AM ERROR.