What the hell is a gigowatt?

Telltale's Back to the Future game has the likenesses of Michael J. Fox and Christopher Lloyd, but only the latter was able to lend his voice to the game too. The second behind-the-scenes documentary from Telltale explains how the company came to recast the role of Marty McFly.

Well, sort of: it introduces you to the voice actor AJ LoCascio, but it's never really explained how he got the part, but once you hear his audition you'll realise there's no need for explanation.

[source gametrailers.com]