Related Clues:

• 1954 sci-fi classic
• The Riddler, to Batman
• See 39A
• Friendly side in a debate
• Hostile bunch
• Adversaries of ''us''
• Sworn enemy
• Gender-neutral pronoun
• They're opposed
• The North and the South, in the Civil War
• "So ___ say" ("That's what I hear")
• Achilles and Hector
• One on the other side
• The Bloods and the Crips, e.g.
• David, to Goliath