Death Mountain

 is a limited-time building which was released on March 10, 2015 as part of the Superheroes Event 2015. It was the second prize of the event's issue 3.

It re-released as a premium item on July 17, 2016, during Issue 3 of the Superheroes 2016 Event for 120 Donuts. The offer available to players that did not unlock Dr. Colossus during the Superheroes 2015 Event.

Regular
Dr. Colossus The Collider
 * Hatch a New Scheme - 8h
 * Punish Minions - 12h
 * Work as a Double Agent - 4h
 * Sabotage Colossus's Plans - 12h

Quest Based
Dr. Colossus Hank Scorpio The Collider
 * Discuss the Terms of the Duel - 8h
 * Crack the Whip - 24h
 * Discuss the Terms of the Duel - 8h
 * Clean Death Mountain - 8h
 * Sabotage the Poult-ray - 60m