If you've been following the Top 40 Star Trek Episodes of All Time, starting Monday, you'll be able to see a few double-headers for the next couple of weeks.

On select days, Airlock Alpha will publish not one, but two entries in its Top 40 Star Trek Episodes of All Time as we get ready to release our top-rated episode of all time on Sept. 8, the 40th anniversary of Star Trek.

With that comes two chances for you to enter in the Roddenberry Countdown Quest. With each entry, you're given a clue which takes you to the Roddenberry Store. Once you find the answer to the clue, you e-mail it in, and become eligible for a series of prize packages from Roddenberry.com, as well as our grand prize of a set of Klingon Battle Cruiser blueprints from the original "Star Trek" series signed by actor Michael Pataki, who played Korax in the episode "The Trouble With Tribbles."

Visit our message boards where you can find the previous installments in our countdown plus previous clues. Although you aren't eligible for prize packs from previous entries, you can still submit your answers since 40 entries from the entire run of the contest will give you 80 chances to win the grand prize.

The Top 40 Star Trek Episodes of All Time are brought to you by Roddenberry.com and Airlock Alpha.