Luke: Luke appeared in the first episode as The Master's most powerful man. He bacame the vessel that the master used to get out of hell. However, he didn't count on Buffy. He was staked in the second episode before the Master could escape.
Gorche Brothers: Lyle and Tector Gorche first appeared in the episode Bad Egg. Tector was killed by the mother while Lyle got away. He appeared in one more episode with his new wife Candy. They were contestants in Mr. Trick's "Slayfest 98." Again, Lyle got away while his companion parished.
Kakistos: A second Master appeared at the beginning of the fourth season in the episode Faith, Hope, and Tricks. This Master was bigger and stronger and yet he went down faster. While the first Master took one season to be killed with a stick, the second Master took one show with a really big pole.
Kralick: Kralick appeared in the episode Helpless. He was part of a test set up by the Watchers Council. They kept him calm through the use of pills until Buffy was weekened. Theyw ere planning to trap her in the house with him to see if she could act without her powers. However, he outsmarted the Watchers Council and captured Buffy's mom. Buffy outsmarted him in the end when she replaced the water he uses to take his pills with Holey water.