Alien VI: Keith
"Keith is an alien who can pass for human, a useful talent that's given him work as The Investigator. He works for a secret society of aliens known as The Visitors and his typical day consists of spying on humans and checking out new arrivals to the planet. But when his partner and a few of the top-level Visitors are killed, he knows his typical days are over. Who is behind the killings? The humans? A rogue alien? Or something else?"
OK, so I forgot about ALIEN VS. PREDATOR (cleverly shortened to AVP) and named this potential flick Alien V as in roman numeral 5. However, in lieu of AVP, it's now Alien VI (6). As a postscript, I present a quick lesson in roman numerals:
Before = subtraction, after = addition... in most cases.
Noli me vocare, ego te vocabo.