What do these have in common?

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Across
  1. 6. A musical with a filmmaker and a guitarist
  2. 7. Aang's flying friend
  3. 10. McFarlane's second shot at TV
  4. 12. The answer to the entire universe
  5. 14. This game got you into the music your parents like
  6. 15. Assistant (to the) regional manager
  7. 16. Stephen! Stephen!
  8. 17. Their revenge brought down the Republic
Down
  1. 1. Chris Rock is a zebra
  2. 2. Successor to Ruby and Sapphire
  3. 3. It's two brothers, in a car, chasing demons
  4. 4. Launch title on the Nintendo DS involving puppers
  5. 5. Vin Diesel with children
  6. 8. How I met...
  7. 9. Jumanji but in space
  8. 11. Not in my lobby
  9. 13. You'll need an ocular pat-down before you enter