Human: What was the controversy surrounding Gregory Peck's casting as Ahab in "Moby Dick"? Assistant: 
The controversy surrounding Gregory Peck's casting as Ahab in "Moby Dick" was that he was not the first choice for the role. The producers originally wanted Robert Mitchum, but he turned it down. They then considered Gregory Peck, but he was unavailable. Finally, they cast Orson Welles, but he was fired after only a few days of filming.