If you loved Alien, try Mission Galactica: The Cylon Attack
A bridge between a film you've already seen and one most people haven't. Mission Galactica: The Cylon Attack has roughly 250.7× fewer votes than Alien — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.
What they share
Theysit in Horror / Science Fiction territory. If that's the register that drew you to Alien, the second film will land in a comparable space — through a different lens.
What Mission Galactica: The Cylon Attack is
Space. Distant alarms. A lone, crippled Galactica nearly out of fuel, facing total annihilation. Salvation appears in the form of the Battlestar Pegasus, thought lost, now engaging the Cylons directly. Classic TV sci-fi gets a theatrical re-edit.

