Related Clues:

• Keep up with
• Pepsi vis-à-vis Coke
• ''Friend or __?''
• Hardly a follower
• Archenemy
• 'Friend or ___?'
• Red, e.g., once
• "Them"
• Friend alternative
• Hostile opponent
• Armed adversary
• One of them?
• The Riddler, to Batman
• Sworn enemy
• Romantic triangle figure