Rangers guide a group of scientists into the woods to search for a gorilla skeleton which they hope will lead to the discovery of a new species. A bone that they found matched a mystery bone from the 1800s, so they rounded up this expedition, even though the lead scientist says perhaps a gorilla escaped from the zoo.... yeah, that sounds plausible.
After being forced to stop for the night, the group finds a bunch of graves, a huge bone matching the one they already have, and the carcass of a bear high in a tree. Yet no one seems alarmed that perhaps whatever killed the bear also dug the graves and probably lives near by.
When a ranger named Spencer disappears, the group starts to get concerned. But not enough to stop them from giving his sister Janet a sleeping pill... in the middle of the woods at night with a potential killer animal on the loose. It's also a mystery as to how Janet got to be a ranger as she is a total wreck and not the sort of person you would want to rely on for anything important like your life.
The lead scientist wants to stick around to gather evidence and report on his find. As it usually is in cases like this, it is a very bad idea. Another bad idea is the CGI sasquatch that looks good in the distance, but is obviously not even with the actors in the shots. There is an amusing moment when the digital camera of one scientist is found with a photo of the sasquatch on it. Yes, that is a lovely "photo" of the CGI bigfoot. She may as well have taken a picture of a Captain Caveman cartoon.