Transformers - Last Stand of the Wreckers (2010)

The Autobot special ops crew, The Wreckers, are sent to investigate Garrus-9, a prison that fell to the Decepticons three years ago with no communication in or out since. Who's really behind the prison siege, and what dark secret awaits Springer there? Writer/artist Nick Roche (Maximum Dinobots) does all the dirty work.
The Unthinkable has happened: the rogue Decepticon OVERLORD has taken over the Autobots' maximum security prison, Garrus-9, and turned everything on its head. Autobots are now prisoners and Decepticons are now guards, and all of them are part of a grotesque experiment.
Enter THE WRECKERS. Nine robots, one purpose: turn up and start shooting.