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In page Epic Rap Battles of History:

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Although early episodes of the series featured only Shukoff and Ahlquist, later episodes have regularly featured guest appearances from internet celebrities including Dan Bull, Lisa Donovan, Timothy DeLaGhetto, George Watsky, DeStorm Power, Jesse Wellens, PewDiePie, Jenna Marbles, Lilly Singh, Ray William Johnson, Rhett & Link, and Smosh. Media celebrities like musicians Snoop Dogg, Chali 2na, T-Pain, Jackie Tohn and "Weird Al" Yankovic, actors J. B. Smoove and Gary Anthony Williams, and the comedy duo Keegan-Michael Key and Jordan Peele have also appeared in the series.[citation needed]