Chellak

General Chellak was the leader of the troop sent to Androzani Minor to force out Sharaz Jek.

When his men captured the Fifth Doctor and Peri, Morgus ordered Chellak to execute them, but Jek replaced them with android duplicates. After Salateen escaped, Chellak launched an assault against Jek. While struggling with him he pulled his mask off. Jek then pushed the horrified Chellak into the path of a mud burst and closed the door on him, leaving him to drown in the mud. (TV: The Caves of Androzani)

Behind the scenes
Steven Berkoff, Michael Gambon and Julian Glover were considered for the role before Martin Cochrane was cast.