Bruce William Boxleitner (born May 12, 1950) is an American actor and science fiction and suspense writer. He is known for his leading roles in the television series How the West Was Won, Bring 'Em Back Alive, Scarecrow and Mrs. King (with Kate Jackson), and Babylon 5 (as John Sheridan in seasons 2–5, 1994–98). He is also known for his dual role as the characters Alan Bradley and Tron in the 1982 Walt Disney Pictures film Tron, a role which he reprised in the 2003 video game Tron 2.0, the 2006 Square-Enix/Disney crossover game Kingdom Hearts II, the 2010 film sequel, Tron: Legacy and the animated series Tron: Uprising. He co-starred in most of the Gambler films with Kenny Rogers, where his character provided comic relief. He also voiced General Moss in the films AniMen: Triton Force and AniMen: The Galactic Battle.
Source : Wikipedia
