I've always had a fascination with robots depicted inf films and on TV. As a kid, Robby the Robot was my favorite. He first starred in the movie Forbidden Planet, released in 1956. I also loved him as a guest star in the '60's TV series, Lost in Space, where he played against another iconic robot, B9. Robby has a ton of other credits in TV and movies. He will always be the best in my book, and it appears that at least one collector felt the same way, and was willing to put over $5M down to hang on to this Hollywood icon.
