A Partial List of Extrasolar Monsters You Should Avoid

Cerambranian man-swallower
Necrotic spore-thrower
Arcturian brainweb worm
Eobrontops
introduced Requium sharks
pyro beetles
Delgonian Mind Leach
Nadrick, of Palain 7
Sargon
introduced venomous warp spider
howler
white tipped neoshark
pig destroyer
Red shafted impaler
creeping shadows
skull flies
zoospores
Xenomorph, variety seven
Xenomorph, variety six
parachuting doll demons
executioner fungi
fangstones
purple worms
doughballs
Mother
Solaris
Mersian
The Legion of Doom