with 9 episodes premiered on April 26, 2011

with 10 episodes premiered on June 6, 2010

with 12 episodes premiered on February 8, 2011

with 12 episodes premiered on August 9, 2011

with 12 episodes premiered on February 14, 2012

with 12 episodes premiered on May 29, 2013

It is an all-star season with all competitors returning from prior seasons.