CONTROL agents are being found murdered with mysterious puncture marks on their necks, leading to speculation that they are being killed by a vampire. The murders are only committed on weekends and the papers speculate that a "weekend vampire" is behind them. The investigation leads Max and 99 to the spooky castle of Dr. Drago. Drago is a disgruntled former CONTROL scientist, who was dismissed for "unauthorized experiments." Max and 99 disguise themselves as newlyweds to get into the house and discover the secret of Drago's coffin. (Synopsis from wouldyoubelieve.com) Originally aired December 18, 1965.