Today I was watching Steven in 'Sky Riders' from 1976. Even though it's not a big part, he has plenty of screen time and is as usual, beautiful, charming and intense...both in the sky riding scenes and later, in the combat scenes.
I recall a while back, coming across an article that described the preparation the actors had to go through for the movie and it was really interesting. If I can find it again, I'll link to it. Here is the Imdb link (listed under the movie's alternate title):