Myers (The Sea Devils)
From Tardis Wiki, the free Doctor Who reference
For the alien Miss Myers, see here.
Chief Petty Officer Myers was a Royal Navy officer who took part in the battle to retake Captain John Hart's base. He shot and killed the Sea Devil who was guarding the Third Doctor and the Master. He was then told to guard the Master, who instead hypnotised him, then knocked him out. (DW: The Sea Devils)