Robert Rodriguez is keeping Project Green Screen moving at full force but has one more task for BlackBerry fans. In the short film, the weapon-wielding sisters fight a monster - but that monster has yet to be created. That's where you come in. 

Robert is asking fans to come up with their craziest, scariest or most over-the-topiest ideas for a movie monster. The winner will be the best and most original monster creation as chose by Mr. Rodriguez himself and a team of artists will bring the creation to life. 

Check out the video above for a quick briefing, then head to the BlackBerry Keep Moving Hub for more.