(written from a Production point of view)
In 1980, he starred as Dr. William Haber alongside Bruce Davison in the made-for-television movie adaptation of Ursula K. Le Guin's science fiction work The Lathe of Heaven. On stage, Conway co-starred with Star Trek: Deep Space Nine actor Philip Anglim in the Broadway play The Elephant Man. Later, in 1982, the two reprised their roles in a made-for-television adaptation of the play. He co-starred in the war epics Gettysburg and Gods and Generals. W. Morgan Sheppard, William O. Campbell and Joseph Fuqua starred in both of these films. Conway had turned down the role of Théoden in the Lord of the Rings films to recreate his Gettysburg role of Buster Kilrain in Gods and Generals.
Conway appeared as himself and the Earl of Hastings in Al Pacino's 1996 documentary Looking for Richard, which also starred Richard Cox, Winona Ryder, and Harris Yulin, taking parts in a mock production of William Shakespeare's Richard III.
Conway appeared in 1998's Mercury Rising, written by Lawrence Konner and Mark Rosenthal. He also played General Curtis LeMay in the 2000 thriller Thirteen Days, with Jack Blessing, Len Cariou, Charles Esten, Tim Kelleher, Boris Lee Krutonog, Ed Lauter, and Bill Smitrovich Jack Blessing, Bruce Greenwood (as John F. Kennedy) and Steven Culp (as Robert F. Kennedy) - and appeared in the 2001 film Black Knight, with Kevin P. Stillwell.
Conway had a recurring role as Seamus O'Reily on the HBO series Oz. He also provided the "Control Voice" for the 1995-2002 revival of The Outer Limits, a role he took over from Vic Perrin. Several Star Trek alumni appeared in guest roles throughout the series, including Rene Auberjonois, Clancy Brown, Kim Cattrall, Bill Cobbs, Ronny Cox, Nicole de Boer, John de Lancie, Michael Dorn, Kirsten Dunst, Michelle Forbes, Robert Foxworth, Matt Frewer, Joel Grey, Bob Gunton, Clint Howard, Andrea Martin, Malcolm McDowell, Leonard Nimoy, France Nuyen, Leland Orser, Ron Perlman, Robert Picardo, Harve Presnell, Saul Rubinek, Alan Ruck, William Sadler, Chris Sarandon, Michael Sarrazin, John Savage, Dwight Schultz, Marina Sirtis, Brent Spiner, David Ogden Stiers, Kate Vernon, Nana Visitor, David Warner, and Wil Wheaton.