Alien for the Atari VCS 2600

http://www.youtube.com/watch?v=D2hTPqNqqJk
This is one the biggest "OMG WTF?!" I've ever had with an old game. How I never knew of this game still baffles me. You'll probably be more shocked when you see the gameplay...
Mega Force for the Atari VCS 2600

http://www.youtube.com/watch?v=qCfBV8SnY9s
Never heard of Mega Force,younger gamers? Well,in many ways it was the movie that was the precurssor of G.I Joe and all the other high-tech based commando teams of the 80s. It had a HUGE hype at the time and that's why I'm shocked I never played this game back then.
Krull for Arcades

http://www.youtube.com/watch?v=jaR3fFxIK0s
The Hell? I knew there was an Atari 2600 Krull game. But it wasn't until a few years ago that I found out there was an arcade game. And with a sweet cabinet to boot. This one probably got lost in the shuffle during the last days of arcade glory.
Gremlins for the Atari VCS 2600

http://www.youtube.com/watch?v=aB2zpI7Wd1M
This one came out during the great crash of '84 so it's probably understandable if I never heard of it at the time.
Hudson Hawk for the NES and Game Boy

http://www.youtube.com/watch?v=pKRDUQb8xPM
Wow,my favorite godawful flick had a videogame? That's news to me...
Congo for the Sega Saturn

http://www.youtube.com/watch?v=tBeGgLTaeBI
I bought this one off e-bay sometime ago. I didn't find out that Congo had a game until a few years back when 1UP had their Broken Pixels show. The game's bad FMV are laughable at best,but it's still worth a play if only for a laugh.
Any other obscure movie games you know of?