Note: this post splinters off of Marvel Live Action Actors in the 1970s: Where are They Now? It has been split into separate posts to give the shows/TV movies more room to breathe.
Info derived from the imdb. All cast members now noted. * = Newly added names from the older post.
Peter Hooten (Dr. Stephen Strange): in House of Blood (2013; also Associate Producer); Souleater (2015; also Associate Producer) in post-production; last previous known acting role in 1990.
Clyde Kusatsu (Wong): in Major Lazer (1 episode 2015), 47 Ronin (2013), Raising Hope (1 episode 2013), The Face of Love (2013), Franklin & Bash (1 episode 2013), The Moment (2013), Ben and Kate (1 episode 2013), The Gabriels (2013).
Jessica Walter (Morgan LeFey): in NCIS: Naval Criminal Investigative Service (1 episode 2015), Star vs. The Forces of Evil (1 episode 2015), Archer (75 episodes 2009-2015), Jennifer Falls (10 episodes 2014), Arrested Development (15 episodes 2013); Keep the Change (2016) in post-production; Operation Insanity (2015) filming; as Self: Inside the Actors Studio (1 episode 2013), Fashion Police (1 episode 2013), Watch What Happens: Live (1 episode 2013), Home & Family (1 episode 2013), Anderson (1 episode 2013), Archer: Season 4 - Archer Live (2013).
Anne-Marie Martin (Clea Lake): last known acting role in 1998, as Self in 2005.
Philip Sterling (Dr. Frank Taylor, Chief of Psychiatry): died in 1998.
John Mills (Thomas Lindmer): died in 2005.
June Barrett (Sarah): last known acting role in 1982.
* Sarah Rush (Nurse): last known acting role in 2012.
* Diana Webster (Head Nurse): died in 2010.
* Bob Delegall (Intern): died in 2006.
* Larry Anderson (Magician): in Can I Get a Witness Protection? (2015).
* Blake Marion (Department Chief): last known acting role in 2006.
* Lady Rowlands (Mrs. Sullivan): died in 1999.
* Ines Pedroza (Announcer): last known acting role in 1988.
* Michael Clark (Taxi Driver): last known acting role in 1998.
* Frank Catalano (Orderly): in Robotech: Love Live Alive (2013); as Self: The Making of Robotech: Love Live Alive (2013).
Michael Ansara (Ancient One voice): died in 2013.
* Ted Cassidy (Demon Balzaroth): died in 1979.
* David Hooks (The Nameless One): died in 2008.