Saints Row Undercover 4 by Porrie on DeviantArt

Saints Row: Undercover - Cancelled PSP Game [Early Prototype Gameplay]

Volition Plays: Saints Row Undercover

開発中止されたPSPソフト『Saints Row: Undercover』のプログラムが発掘のうえ、なんと半公式に無料公開される - ファミ通.com

The Story of the Forgotten PSP Game, Saints Row Undercover - IGN

Inside Volition: Saints Row Undercover, Page 3

Would Saints Row Undercover have been a good replacement for 3? How do you think it would have been, and how would the series continue after? : r/RealSaintsRow

Saints Row 2 (Video Game 2008) - Plot - IMDb

Saints Row: Undercover (2009)

Saints Row Undercover' Is Playable Right This Second. Yes, Really.

Saints Row 2 I Like It and it Sucks