Krail

Krail was a Cyberman from the planet Mondas. He was one of the first wave of the Cybermen force which invaded the Snowcap Base in Antarctica in December 1986 with the intention of detonating a Z-Bomb in its missile silo. Krail acted as leader and spokesmen of the Cybermen and refuted the First Doctor's statement that emotions had value.

With other Cybermen, Krail was killed by a handheld Cyber-weapon used by Ben Jackson. (TV: The Tenth Planet)

Behind the scenes
Krail was to appear in the abandoned script of Genesis of the Cybermen.