Related Clues:

• Mr. Hyde, for one
• Mr. Hyde, e.g.
• Lucky Jim, for one
• Hyde, to Jekyll
• Bruce Wayne, to Batman
• One of the 'three faces of Eve'
• Ex-orphan
• See 9-Down
• Unlikely protagonist
• One who's taken in
• Trusted friend
• Perfect substitute
• Ernie of ''My Three Sons,'' e.g.
• Willy Loman, for one
• Mr. Hyde, to Dr. Jekyll