DreadPirateMurphy
Explorer
Here are 10 repeat, memorable antagonists. I don't think I've fogotten any obvious ones like Harry Mudd in the TOS poll. 
trancejeremy said:Troi's mother.
Nightfall said:Tie: Q and the Borg, with Q winning out on personality.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.