My favorite Avengers episode.
https://en.wikipedia.org/wiki/From_Venus_with_Love
Several astronomers—and members of the British Venusian Society—have been found dead, their hair bleached white. The Society had planned on sending a satellite to the planet Venus. As Steed and Peel investigate, they discover all the astronomers had been looking directly at the planet before they were found dead, which members say heralds an invasion by the Venusians. Steed and Peel soon uncover a scheme featuring lasers, a treacherous eye surgeon Dr. Primble, and a quest to launch a satellite to monitor Venus.