Fox announced Monday that it will produce a series of two-minute mobisodes--short TV episodes for mobile phones--that complement the plot of the hit drama Prison Break.

The 26-installment serial, Prison Break: Proof of Innocence, will introduce the character Amber McCall, who works feverishly to clear her friend L.J. Webisode producers were allowed complete access to the show's location, filming many of the exterior shots at the deserted Illinois prison that stands in for Prison Break's Fox River State Penitentiary.

Proof of Innocence will be available for free exclusively to Sprint customers for viewing on SprintTV's Fox station starting this week. In two weeks they will be available on Toyota.com.

This is not the first time Fox has answered the mobile phone call, having already given action fans their weekly dose of pocketsize drama with the first-ever scripted mobisode series, 24: Conspiracy. The upcoming Prison Break spin-off is the first of its kind to be supported by advertising.

Toyota will air ten second messages at the beginning of each mobisode and each segment will prominently feature Toyota vehicles, according to a joint statement made by the car manufacturer and Fox. The deal also hands Toyota the reins to create a Prison Break "microsite" on Fox's Website which will feature behind-the-scenes video, Prison Break info, and an extensive Toyota ad campaign.