A few days ago, a prototype for a cancelled PSP game based on the Saints Row franchise, called Saints Row: Undercover, resurfaced via a video coming directly from Volition:

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It started off as a port of Saints Row 2 but as Volition soon realised that such a task would be impossible, they decided to make an entirely new game altogether. It was quite far along in development according to Volition however it was cancelled by THQ amidst financial difficulties.

Well today Volition released the ISO of that prototype that you can play on your (modded) PSP or via the PPSSPP PC emulator.
Grab the ISO here.