To Catch A Changeling is the seventh episode of season one of Trollhunters.


After Jim finds the Killahead Bridge has been moved, he must use a gaggletack (an artifact that looks like a horseshoe) to find who in Arcadia is a changeling. If he touches a changeling with the gaggletack, they change from human form to troll form, so Jim and Toby go around the school touching everyone with the gaggletack to see who is a changeling.

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