Muscle Mentor After getting fired by Benson, Rigby goes into the mentor program and Muscle Man turns out to be his mentor, things don't go as planned. Details Casts Videos Galleries Posters Season Lists Title Muscle Mentor Genres Animation Comedy Release Date 2012-06-11 Episode Runtime 00 Hours 11 Minutes Season Number 3 Episode Number 29 Production Companies Cartoon Network Studios J.G. Quintel... Mordecai / Hi Five Ghost ... William Salyers... Rigby (voice)... Mark Hamill... Skips (voice)... Sam Marin... Benson / Pops / Muscle Ma... Regular Look at Regular Show (Clip) Original Size (1920x1080) Original Size (1280x720) Original Size (3840x2160) Original Size (1920x1080) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (1600x900) Original Size (1280x720) Original Size (1920x1080) Original Size (2973x1673) Original Size (1920x1080) Original Size (1920x1080) Original Size (1920x1080) Original Size (1920x1080) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (1920x1080) Original Size (1920x1080) Original Size (1000x1500) Original Size (2000x3000) Original Size (1000x1521) Original Size (2000x3000) Original Size (2000x3000) Original Size (2000x3000) Original Size (2000x3000) Original Size (1708x2562) Original Size (680x1000) Original Size (641x938) Original Size (2000x3000) Original Size (960x1440) Original Size (1708x2562) Original Size (667x1000) Original Size (1000x1500) Original Size (552x827) Original Size (680x1000) Original Size (832x1280) Original Size (600x900) Original Size (1200x1800) Original Size (2000x3000) Original Size (1708x2562) Original Size (1708x2562) Original Size (1856x2644) Original Size (667x1000) Original Size (2000x3000) Original Size (1200x1800) Original Size (720x1080) Original Size (720x1080) Season 1 12 Episode(s) 2010-09-06 Season 2 28 Episode(s) 2010-11-28 Season 3 39 Episode(s) 2011-09-19 Season 4 40 Episode(s) 2012-10-01 Season 5 40 Episode(s) 2013-09-02 Season 6 31 Episode(s) 2014-10-09 Season 7 36 Episode(s) 2015-06-26 Season 8 31 Episode(s) 2016-09-26