 The episode features Andy Milonakis reprising his role as N.E.P.T.R. , a character that was last seen in the first season episode " What is Life ? " The short rap " Working for the Master " that is sung by N.E.P.T.R. was written by Sugar . She had originally planned for her demo version to merely be a filler track , as she expected Milonakis to want to write his own rap . To her surprise , however , Milonakis enjoyed her version and wanted to perform it the way it was written . Sugar 's father , Rob , later released her demo version on his YouTube channel . Series composer Tim Kiefer produced the song 's instrumental . Inspired by Wu @-@ Tang Clan 's penchant for sampling , Kieffer took his music from the season one episode " What is Life ? " and edited it substantially , creating the " clattery <unk> ' beat " featured in the episode . 
