(Why did FFnet store those two series together? Surely it would make more sense to have them separate and mark crossovers as... well, crossovers...)

Anyway...

BADFIC ALERT TIME (YAY):
http://www.fanfiction.net/s/5150409/1/UNKNOWN_SPECIES
Synopsis: "what if predators and humans came across a species never been seen or heard of before? would they be a fight to see whom would catch this creature first? please read on to find out."
(Also categorised under "Friendship/Fantasy", which is less than promising)

Amusing quotes:
"When the story gets going you will read the predators thoughs and the same with other characters."

"He was missiled out into earth’s atmosphere."

Has such fun features as random tense shifts, messed up verbs ('layed', the aforementioned 'missiled' etc), frequent ditching of the Capital Letter at the start of sentences (but no aversion to CAPSLOCK at times), ocassional misplacement of commas in plurals ("seem's") etc...

I'd take this one, but it's Predator-centric so far, and I'm more versed in Aliens. Stupid ffnet's categorisation system...