Related Clues:

• One of them?
• The Riddler, to Batman
• Newman, to Jerry Seinfeld
• One on the other side
• David, to Goliath
• Bizarro, to Superman
• A McCoy, to a Hatfield
• One to go up against
• Macduff, to Macbeth
• One against another
• Very tough thing to lick
• Old enemy
• Axis, once
• The other army
• No proponent