Arnold Schwarzenegger was fairly unknown, unless you were a follower of muscle contests (Mr. Universe five times, Mr.Olympia seven times and Mr. World once.) His English was not very good yet.....but that didn't keep him from working on his first movie. It did, however, keep him from speaking a single word throughout the film.
The movie, HERCULES IN NEW YORK, was released in 1970, and Arnold lip-synched throughout the picture. It is rather funny, now, watching Arnold's mouth move, and listening to a total stranger's dubbed voice come out.
HERCULES CLASHES WITH AUTHORITY ON EARTH:
The movie was re-released under two other names:
After the ship docks, Hercules takes up with an Earthling who becomes his 'sidekick', played by Arnold Stang.