Saduj

Saduj is found in Ultima V, sneaking around the roof of Castle Britannia in the night, acting suspiciously.

At first Saduj didn't say much. However, after the Avatar identified himself as a member of the Oppression by saying the password "IMPERA", Saduj became much more talkative. Saduj was a spy sent by Lord Blackthorn to get possession of the Sandalwood Box, to ensure that Lord British would be sealed in the dungeon Doom permanently. He then offered his services to the Avatar's party. The Avatar declined, as he promised to be nothing but trouble.

Trivia

 * Should the player let Saduj join anyway, he will betray the party in combat as soon as possible.
 * Appropriately, "Saduj" is Judas spelled backwards.
 * Even worse, in Lazarus, Saduj steals the Sandalwood Box and then makes a run for it, meaning an instant game over.