10 Amazing Plot Twists In Otherwise Awful Movies

Pandorum, with its terrible editing and messy screenplay, is an ultimately unsuccessful sci-fi horror flick that fails to ever feel like much more than yet another Alien rip-off, and it would've been forgotten a long time ago were it not for the double-whammy plot twist at the end.

The film takes place on a spaceship transporting the last of humanity to a new planet after Earth becomes uninhabitable. Two crew members - Bower (Ben Foster) and Payton (Dennis Quaid) - wake up from cyro-sleep to find that the ship is damaged and overrun with cannibalistic mutants. Throughout the picture, it gradually emerges that the ship's captain Gallo went insane and killed most onboard, while those who remained became the mutants. 

And then, after 90 minutes of poorly-lit fight scenes, the twist emerges... and it's a doozy. Firstly, Payton is Gallo (he'd temporarily forgotten this due to amnesia), and secondly, the ship landed on the new planet 800 years ago and they're underwater, not in space. Both twists are brilliantly shocking and set the stage for an uproariously satisfying and unexpectedly hopeful climax in which Gallo/Payton is finally killed and Bower, secondary lead Nadia (Antje Traue), and the surviving, uninfected passengers are released to the surface, ready to start anew.

This ending doesn't save the movie outright, but it does at the very least make it a partly rewarding viewing experience, and it remains one of the best conclusions to a bad movie... probably ever, to be honest.