Monsters,
Aliens & (nearly)
Everything Else
This list is a bit of a coverall, like it says on the tin it's for Monsters & Aliens plus those other films that don't really fit anywhere else deserve mention for one reason or another, deal with it.
Most of those listed are pretty obvious aliens or monsters or maybe even both but for example how about "The Crazies" they're sort of zombies but aren't really flesh eaters but definitely won't to kick your arse in a bloody sort of way, ditto "Carriers or Doomsday" it's post-apocalyptic viral end of the world kinda stuff, or how about "Gabriel or Ghosts of Mars" Most importantly however, they float my boat & it's my list so therefore I'm including it here under the 'everything (nearly) else' category, ta-daaaa.
Alien
Aliens
Alien III
Alien Resurrection
Alien vs. Predator
Alien vs. Predator: Requiem
Altered
Carriers
Cloverfield
Constantine
Cowboys & Aliens
Day Watch
District 9
Doomsday
Gabriel
Ghosts of Mars
Godzilla (1998)
Gothic
Hellboy
Hellboy II: The Golden Army
I Sell the Dead
John Carpenter
Night Watch
Outlander
Pontypool
Predator
Predator II
Predators
Prometheus
The Crazies (1973)
The Crazies (2010 remake)
The Lair of the White Worm
The Mummy (1999)
The Mummy Returns (2001)
The Mummy: Return of the Dragon Emperor (2008)
The Red Planet
The Scorpion King (2002)
The Thing (1982)
The Thing (2011)
The Wild Hunt
Troll Hunter
Young Frankenstein