Robert Rodriguez and BlackBerry‘s user-generated movie-make-a-thon, Project Green Screen, continues this April. The Sin City director’s new comic-book thriller, Two Scoops, is semi-finished and divided into three acts, and invites YOU to throw your ideas into the creative mix.

The film is centred on two lead protagonists, twins Lola and Lucia, who run an ice-cream truck in a town where people are being abducted by an unknown ‘thing’ – and they just so happen to be monster hunters in their free time.

Wanna be a part of Two Scoops?

In Act One, we asked you to download the Two Scoops script and film yourself acting it out for a chance to win a starring role, as well as submitting your photos to appear on a missing townsfolk poster in the film.

Now it’s time for Act Two and the latest opportunity to play your creative part in the project.

Act Two: Dream up an outlandish weapon for Lola and Lucia to wield in their battle against the ‘thing’ that’s terrorising their hometown.

What is your weapon of choice when facing a formidable monster? What is it made from? What does it fire? Now is your opportunity to imagine the greatest monster-slaying super-weapon the world has ever seen.

Invent an ass-kicking device and describe it in a Tweet to Robert Rodriguez (@Rodriguez), and don’t forget to use the the hashtag #KeepMoving.

If Robert likes your idea he will create the weapon in post-production and it will be included in the final film. Your submissions will be hosted on the BlackBerry Hub for the world to see.

*Update April 17: Submissions are now closed but stay tuned for more documentaries from Robert Rodriguez and BlackBerry, as well as the release of Two Scoops on May 15.*