Related Clues:

• He's not for us
• "Them," with "the"
• Archrival
• ___ territory
• The Joker, to Batman
• They don't get along
• Reds, once
• Jets, to Sharks
• Moriarty, to Holmes
• Hostile parties
• Contenders
• Far from friends
• York, to Lancaster
• Bad guys
• The Axis to the Allies