I know! and the Brig!!!! I really wanted there to be an episode where the 3rd and 4th Doctor, Brig, Sarah Jane, Harry, and Benton meet the current Doctor (whoever that happened to be). Obviously, I knew that wouldn't happen. *whimper* There are only two still alive--the 4th Doctor and Benton.
...the original Master (Roger Delgado) is dead too. Though he died during the time of the 3rd Doctor. They were planning to have a storyline where the Master died to save the Doctor, but the actor died. Sooo... we know have a reoccurring villain. Ironic, isn't it?