Special Guest Stars Will Forte voices Old Scott Nick Frost voices Studio Security #2 Simon Pegg voices Studio Security #1 Stephen Root voices The Nanomachines Guest Stars Dorah Fine voices Additional Voices Jackie Lastra voices Additional Voices Stefan Johnson voices Announcer Lily Lammers voices Additional Voices Caleb Yen voices Additional Voices Alan Lee voices Additional Voices Deneen Melody voices Additional Voices Phillip Reich voices Additional Voices Abdiel Gonzalez voices Singer Julian Cihi voices Katayanagi Twins Sara Mann voices Singer Dylan Gentile voices Singer JJ Lopez voices Singer Jamal M. Moore voices Singer Gerald White voices Singer Suzanne Waters voices Singer Anna Schubert voices Singer Griffin Newman voices Actor in the Movie Courtney Lin voices Demon Girl #3 Courtney Lin voices Demon Girl #1 Angie Sarkisyan voices Demon Girl #2 Chris Hackney voices Additional Voices Jessica Rotter voices Singer Angie Sarkisyan voices Demon Girl #4 James Hayden voices Singer Tony Oliver voices First A.D. Kirby Howell-Baptiste voices Lucas's Agent Kristina Pesic voices Sandra Ingrid Haas voices Monique Manu Narayan voices Singer Heather Youmans voices Singer Kyle Wyatt voices Guy Who Yells The Title Allie Feder voices Singer Jasper Randall voices Singer Jon Robert Hall voices Singer Cory Doran voices Person Next to Wallace Fletcher Sheridan voices Singer Baraka May Williams voices Singer Will Collyer voices Singer Andrew Jackson voices Lobby Announcer