Telltale's first episode of the Back to the Future game won't be free -- unless you've got power. Specifically, we're talking: "121GIGAWATTS" of power! That code, first spotted in the Blu-ray release of the time-traveling movie trilogy, grants access to a free copy of the first episode of the five-part series on PC or Mac.

Unless you're just "chicken," you can now make like a tree and register in advance for the free episode (which requires a Telltale account). Redeemers will be contacted in the future about when they can go back ... to the future -- in other words, this December.

This article was originally published on Joystiq.

Fable 3 'Dog Outfit' DLC isn't what you think it is