The Shapeshifter is a villain from Gravity Falls. He debuts in the Season 2 episode "Into the Bunker".
He is an experimental creature that was accidentaly created by the creator of the Journals. Dipper and Wendy thought they saw the creator of the Journals, but they suddenly realize that it was actually the Shapeshifter who got a hold of the Journal so he can transform into several different creatures to take over Gravity Falls but is foiled when Dipper figures out the fake Wendy from the real Wendy thus shoving the Shapeshifter back into the containment chamber and he resumes his last form as Dipper before he freezes.
- He is based off of John Carpenter's The Thing.