Marvel Avengers HQ Hulk Buster Breakout Set Hulk Buster Breakout set lets you build your own Avengers HQ Includes Hulk and Hulk Buster figures Lab walls collapse when Hulk smashes them Hulk Buster figure slides on zipline Build your HQ by stacking the Hulk Buster Breakout set with the Captain America Tower Defense set (sold separately)