4. Terry O'Quinn
Best Known For "Lost"
Appears In "Aubrey" 1995 Mulder and Scully are called to the town of Aubrey when the remains of a dead FBI agent are discovered by the local police detective. Mysteriously, the detective explains that frightening visions were the only thing that lead to her discovering the body and its not long before a string of new murders in the town become seemingly connected. Terry OQuinn does his best Im not the killer shifty eyes as the towns Lieutenant, lurking in the background as the agents race to connect the dots between the bodies that are popping up and the one recently dug up Of course, its always the one that you least suspect, but good old John Locke Terry OQuinn keeps you guessing right till the end. OQuinn enjoyed his time with the X-Files team so much, he makes two further appearances as completely different characters, first in the 1998 feature film The X-Files and then in a 2002 episode Trust No 1.