Krasis

Krasis was the High Priest of Poseidon in Atlantis c. 1500 B.C. and the servant of Kronos.

Biography
brought Krasis forward in time to the 1970s to help him take control of Kronos. When they did, the Master brought him back to Atlantis in his TARDIS.

He was killed when Kronos destroyed Atlantis. (TV: The Time Monster)