Wow! I had no idea that the show did a full on alien monster invasion story. A thinking, moving, man eating plant from outer space with the ability to control minds has arrived from a crash landed space probe sent up to explore space. It proceeds to command prominent botanists in a plot to help it take over the earth. Of course, it's up to Steed and Peel to stop it. One of the most interesting aspects of the episode to me is showing what would happen if Steed had to fight Mrs. Peel. I got a kick out of the elderly lady botanist expert who's brought in to help figure out what's going on. She's a hoot.