It's time to vote on which two titans of terrible science fiction will battle it out in our championship game. Will Catwoman's underdog run continue against The Last Airbender? And who makes the worst scifi: John Travolta or Eddie Murphy?

These are the questions, as you vote on the Final Four of March Movie Madness. You can find all the polls down below. As far as criteria for voting goes, we leave it in your hands. Vote by how you feel. What makes a bigger flop: shattered expectations, or just general crappiness? It's up to you to decide. Today marks the first round. The polls will be open until midnight PST tonight. Our championship game is Monday, April 2.

VOTE RIGHT NOW for the movie you think deserves the title of Worst Scifi Movie Ever Made. This round of polling ends tonight at midnight PST.

Today's Final Four matches a pair of bizarre futuristic misfires in Battlefield Earth and The Adventures of Pluto Nash - two movies that seriously make you wonder what anyone involved could possibly have been thinking - and two horrendous knock-offs of vastly superior source material in The Last Airbender and Catwoman. Both Catwoman and Battlefield Earth cruised into the Final Four with over 2/3 of the vote, while The Last Airbender fought and ultimately beheaded a worthy challenger in Highlander II: The Quickening. You can click on the bracket on the left for a complete rundown of all the previous matchups. But how they got here no longer matters. All that matters is which of these four movies will advance to claim the dubious glory of being your choice for the worst science fiction movie ever made.