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Across
  1. 1. Where Marty McFly is trapped in the first movie (5)
  2. 2. A religious symbol placed horizontally (1)
  3. 4. "___ West Wing" (4)
  4. 6. Cosmologist's study (3)
  5. 7. First word in all but one "Seinfeld" episode title (2)
  6. 8. Relationship between a part and a whole (9)
  7. 9. Marty needs to get back here (8)
  8. 10. Law-Order connector (7)
Down
  1. 1. This puzzle will reveal yours (6)
  2. 3. Your current engagement (11)
  3. 4. Article that's only 60 per cent there? (10)
  4. 5. Jigsaw, e.g. (12)