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Robot Rampage is the fourth volume in the Hero Factory: Secret Missions series released on March 1st, 2013 by Greg Farshtey. Its storyline concerns the apparent resurgence of the evil Brains and explains the absence of Mark Surge from the associated toy wave.
This is a description taken from LEGO.com. Do not modify it.
As soon as Stringer sends a warning message from the planet Tranquis VII, he vanishes. Stormer quickly dispatches Bulk and Furno to the inhabited planet to find out what has happened to their teammate and seek out whatever threat has made the entire planet go radio silent.
Once again, the brains have taken over almost all intelligent life on the planet. But things are different this time around. Bulk and Furno are about to discover that what looks like another invasion attempt is just covering up a much deeper and more sinister plot that will rock Hero Factory at its core.