Guess the Theme Puzzle #1

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Across
  1. 1. Clue 6D+12D
  2. 4. First name of the first female Republican nominee for VP
  3. 6. Italian for "land"
  4. 8. Largest lizard of the Americas
  5. 9. this option doesn't exist, according to a little green man from outer space
  6. 11. Theme of this puzzle
Down
  1. 1. parts of cereal boxes that could be valuable to your kid's school
  2. 2. Clue 6A+5D
  3. 3. Clue 9A+4A+1D
  4. 5. one stressed syllable followed by two unstressed syllables
  5. 6. A drink with jam and bread
  6. 7. Clue 8A+10D
  7. 10. It's always darkest before this
  8. 12. The reigning king, used in the title of a law suit