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 imdb. * = Newly added name from original post. All known cast members now noted.
Captain America (1979)
Reb Brown (Captain America): in Night Claws (2013); Surge of Power: Revenge of the Sequel (nd) in post-production; last previous known acting role in 1998; as Self: Howling II: Your Sister Is a Werewolf: Leading Man (2015).
Len Birman (Dr. Simon Mills): last known acting role in 1993.
Heather Menzies (Dr. Wendy Day): last known acting role in 1990, as Writer in 2005, as Self in 2010.
Robin Mattson (Tina Hayden): in General Hospital (84 episodes 1980-2015).
Joseph Ruskin (Rudy Sandrini): died in 2013.
Lance LeGault (Harley): died in 2012; in Prince Avalanche (2013).
Frank Marth (Charles Barbe): died in 2014.
Steve Forrest (Lou Brackett): died in 2013.
* Chip Johnson (Jerry): last known acting role in 1988.
* James Ingersoll (Lester Wiant): in Olympus Has Fallen (2013).
* Jim B. Smith (F.B.I. Assistant): died in 2009.
* Jason Wingreen (Surgeon): last known acting role in 1994.
* June Dayton (Secretary): died in 1994.
* Diana Webster (Nurse): died in 2010.
* Dan Barton (Jeff Haden): died in 2009.
* Ken Chandler (1st Doctor): last known acting role in 1997.
* Buster Jones (Anesthetist): died in 2014.
* Nocana Aranda (Throckmorton): last known acting role in 1982.
* Michael McManus (Ortho): last known acting role in 2001.
* Lonnie Pense (Wino in Park): last known acting role in 1984.
Captain America II: Death Too Soon (1979)
Reb Brown (Captain America), Len Birman (Dr. Simon Mills): see Captain America (1979)
Connie Sellecca (Dr. Wendy Day): last known acting role in 2012; as Executive Producer/Writer/Director: Intelligence for Your Life (1 episode 2015, 54 episodes 2014-2015 as Self).
Christopher Lee (Miguel): died in 2015; in Extraordinary Tales (2015), The Hobbit: The Battle of the Five Armies (2014), LEGO the Hobbit: The Video Game (2014 video game), The Girl from Nagasaki (2013), Night Train to Lisbon (2013); Angels in Notting Hill (2015) completed; as Self: Timeshift (1 episode 2014), Face of Unity (2014), Necessary Evil: Super-Villains of DC Comics (2013), Brisant (2 episodes 2013).
Katherine Justice (Helen Moore): in The Nevermore Chronicles (1 episode 2015); last previous known acting role in 1993.
Christopher Cary (Professor Ian Ilson): died in 2000.
William Lucking (Stader): in Murder in the First (2 episodes 2014), Switched at Birth (2 episodes 2013).
Stanley Kamel (Kramer): died in 2008.
* Ken Swofford (Everett Bliss): last known acting role in 2004.
* Lana Wood (Yolanda): in Bestseller (2015), Donors (2014); Killing Poe (2015) in post-production; The Executive (nd) filming; Rachel (nd), Race to Judgment (2017) in pre-production; Byer's Bog (nd), Holly, Jingles and Clyde 3D (2017) announced; Virtue (nd) in production; as Self: Too Young to Die (1 episode 2014), The Playboy Morning Show (1 episode 2013).
* Arthur Rosenberg (Doctor): last known acting role in 2004.
* William Mims (Dr. J. Brenner): died in 1991.
* Alex Hyde-White (Young Man): in Shameless (1 episode 2016), A Kind of Magic (2015), Agents of S.H.I.E.L.D. (1 episode 2015), Cloudy with a Chance of Love (2015); Surge of Power: Revenge of the Sequel (nd) in post-production; as Self: Behind the Mask: The Making of The Phantom of the Opera (2015); as Self: Doomed: The Untold Story of Roger Corman's the Fantastic Four (2015), Behind the Mask: The Making of The Phantom of the Opera (2015).
* Lachelle Chamberlain (Young Girl): last known acting role in 1983.
* Susan French (Mrs. Shaw): died in 2003.
* John Waldron (Peter Moore): no known subsequent acting roles.
* Timothy O'Hagan (Cal; uncredited): last known acting role in 1990.