Christopher Reeve later made even higher gains for "Superman III" (1983), though for "" (1987), he decided it would be healthier to focus more on cardiovascular workouts. One of the reasons Reeve could not work out as much for "" was an emergency appendectomy he had in June 1986. Reeve was never a Superman or comic book fan, though he had watched "Adventures of Superman" starring George Reeves. Reeve found the role offered a suitable challenge because it was a dual role. He said, "there must be some difference stylistically between Clark and Superman. Otherwise, you just have a pair of glasses
Superman (1978 film) project. The release included making-of documentaries directed by Thau and eight minutes of restored footage. Thau explained, "I worked on "Ladyhawke" and that's how I really met Dick [Donner] and Tom Mankiewicz. I used to hear those wonderful stories in the cutting room that Tom and Dick and Stuart would tell about "Superman" and that's how I kind of got the ideas for the plots of 'Taking Flight' and 'Making Superman'". Donner commented, "There are a few shots where Chris [Reeve]'s costume looked green. We went in and cleaned that up, bringing the color back to where it should be."