The Makuhero Vengeance Attack is the most cataclysmic event that ever ocurred in Hero Factory history. It happened on July 18th, 2011. The event ocurred when Von Nebula was freed from his staff - and the Fire Lord and Witch Doctor joined forces with him, creating an all-out attack on Makuhero City. Each of the three villains brought their set of allies to the city, and began to launch a full-whipeout of everything in the city.
July 17th, 2011
8:30 A.M. Von Nebula is broken out of his staff by two corrupted Waspix - which successfully break through security and manage to crack open the sphere on his staff. Before the surviving guards could catch him - the two Waspix had cleared a path for him to escape.
8:50 A.M. The Hero Factory Police Department appears and put out a search to find Von Nebula. However, they fail on finding him - and was confirmed to have escaped the city at around 9:00.
April 19th, 2012
All captives of the Hero Factory Prison Center escape.
April 20th, 2012
Akiyama Makuro makes the announcement to the public that Von Nebula poses no major threat and has been recaptured, lying in order to pursue a calm public.