Eirak

Eirak was the leader of the Vanir on Terminus.

Biography
When Valgard challenged his leadership, Eirak agreed to step down if Valgard would bring the Fifth Doctor back from the Forbidden Zone. He eventually did. The Vanir were freed when Nyssa offered to synthesise hydromel for them. (TV: Terminus)

Behind the scenes
Sean Arnold, Nicholas Ball, Ralph Bates, Christopher Cazenove, Tom Chadbon, Ben Cross, Jack Galloway, Nigel Havers, Richard Heffer, Martin Jarvis, Jeff Rawle, Patrick Ryecart, Paul Shelley, Simon Ward and Simon Williams were considered for the role before Martin Potter was cast.