Telltale has revealed that Michael J. Fox has lent his voice to the last episode of the firm’s Back to the Future series. This is probably the big surprise the firm was on about last month.

In the episode, titled OUTATIME, Marty McFly will still be voiced by actor A.J. LoCascio, but Michael J. Fox will appears as of Marty’s ancestors.

The reveal was shown in the latest episode of GTTV at the 5:40 mark.

Episode 5:OUTATIME will be released on PC June 23.

Thanks, Joystiq.