Man from Atlantis (1977) was the first of four successful TV-movies, to be followed by an unsuccessful series. It's a reasonably interesting story about a water-breathing man from Atlantis stuck in the modern world. Features a fine mad scientist.
Venus Smith, the forgotten Avengers girl. She was Steed's partner in six 1963 episodes. Fascinatingly different from the other Avengers girls. She had zero combat skills but she was a useful agent. And quite charming.