- Tacho
- Â Roger / ... 62 episodes, 2013-2018
- Michael Pope
- Â Carl / ... 61 episodes, 2013-2018
- Bart Maddux
- Â The Professor / ... 56 episodes, 2013-2018
- Cory Heart
- Â Liz / ... 45 episodes, 2013-2018
- Elle Perot
- Â Tiffany / ... 37 episodes, 2013-2018
- Hexum Black
- Â Biff / ... 22 episodes, 2013-2018
- Chris Ospina
- Â Felix / ... 20 episodes, 2013-2017
- Rachel Sandle
- Â Claire 12 episodes, 2013-2016
- Myana Lee
- Â Lisa / ... 12 episodes, 2013-2015
- Sally Lou Bishop
- Â Ruth / ... 11 episodes, 2014-2018
- Elisa Tshiliata
- Â Razina 10 episodes, 2017-2018
- A.A. Stout
- Â Norbert / ... 10 episodes, 2013-2018
- Bruce Nunes
- Â Announcer / ... 9 episodes, 2013-2016
- J.S. Asimov
- Â Robert Goodfellow 8 episodes, 2013-2016
- Tierney Hackaday
- Â Abby / ... 8 episodes, 2013-2017
- Jason Dmitruk
- Â Ponzo / ... 6 episodes, 2015-2018
- Caitlin Buckley
- Â Madison 6 episodes, 2015-2018
- Matthew Reynolds
- Â Lemi / ... 5 episodes, 2014-2017
- Taylor Maddux
- Â Einstein Impersonator / ... 5 episodes, 2015-2018
- Mark Maddux
- Â Jebediah 4 episodes, 2015-2018
- Yuliana Butchko
- Â Trisha 4 episodes, 2014-2016
- Katie Nicole Valencia
- Â Anne / ... 4 episodes, 2013-2014
- Brian McNair
- Â Eugene / ... 4 episodes, 2013-2015
- Norma Morales
- Â Angela 3 episodes, 2014
- Tyler Travillian
- Â Robo Bob / ... 3 episodes, 2014-2018
- Eric Ireri
- Â Andrew / ... 3 episodes, 2013
- Anne Stout
- Â Edna 3 episodes, 2016-2017
- Polly Deston
- Â Norbert's Mom 3 episodes, 2013-2014
- Tommy Graves
- Â Bob O. Rob 3 episodes, 2014-2017
- Colin Martin
- Â Dr. Gainsworth 2 episodes, 2013
- Stew Dude
- Â Dr. North 2 episodes, 2013
- Jessica Estrada
- Â Edna 2 episodes, 2017-2018
- Tambo
- Â Poetry Person 2 / ... 2 episodes, 2013
- Kalyn McCabe
- Â Daisy 1 episode, 2018
- Tyler Ryan
- Â Bozonius 1 episode, 2018
- Trina Deuhart
- Â Mary 1 episode, 2016
- Val Münster
- Â Dr. Phillips 1 episode, 2013
- Pam
- Â Woman 1 episode, 2016
- Pascal Bakari
- Â Kaylan 1 episode, 2018
- Robert Stout
- Â Burkle 1 episode, 2014
- Amber
- Â Scientist 1 episode, 2014
- Ashe Richards
- Â Xitlrzx 1 episode, 2015
- Mmesoma Okafor
- Â Nurse 1 episode, 2017
- Java Ruzo
- Â Student 1 episode, 2016
- Libby
- Â Girl 1 episode, 2015
- Brian Beaudry
- Â Randall 1 episode, 2016
