Cheryl
Character
Gender	Female
Occupation	Waitress
Series Information
First episode	The Middle Earth Paradigm
No. episodes	2
Portrayed by	Erin Allin O'Reilly

Cheryl was a colleague of Penny's at the Cheesecake Factory.

She attended Penny's Halloween party, in "The Middle Earth Paradigm", and bumped into Raj after having downed a couple of drinks, or so we think. She proceeded to ask him "How wasted am I?" Raj did not answer because of his selective mutism. Later that night, Cheryl, through no persuasion or speech whatsoever from Raj, had sexual intercourse with him, calling him "such a good listener."

In "The Pancake Batter Anomaly", Cheryl was seen again working at the Cheesecake Factory, and when a sick Sheldon appeared she warned Penny about the "crazy homeless guy at table 18", to which Penny answered, "no... just crazy".

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Cast
Main Characters
Leonard Hofstadter - Sheldon Cooper - Penny - Howard Wolowitz - Rajesh Koothrappali - Bernadette Rostenkowski-Wolowitz - Amy Farrah Fowler - Stuart Bloom
Minor Characters
Althea - Stephanie Barnett - Mary Cooper - Eric Gablehauser - Beverly Hofstadter - Zack Johnson - Priya Koothrappali - Mrs. Koothrappali - V. M. Koothrappali - Barry Kripke - Kurt - Mike Massimino - Dimitri Rezinov - President Siebert - Wil Wheaton - Leslie Winkle - Mrs. Wolowitz
Guest Appearances
Buzz Aldrin - LeVar Burton - Summer Glau - Brian Greene - Stephen Hawking - Stan Lee - Mike Massimino - Leonard Nimoy - Katee Sackhoff - Charlie Sheen - George Smoot - Brent Spiner - George Takei - Neil deGrasse Tyson - Wil Wheaton - Steve Wozniak
Extras
George Cooper - Sheldon Cooper's grandmother - Floyd Hofstadter - Michael Hofstadter
Staff
Actors
Johnny Galecki - Jim Parsons - Kaley Cuoco - Simon Helberg - Kunal Nayyar - Mayim Bialik - Melissa Rauch - Kevin Sussman - Sara Gilbert - John Ross Bowie - Carol Ann Susi - Laurie Metcalf - Wil Wheaton - Christine Baranski - Brian Wade - Mark Harelik - Sara Rue - Aarti Mann
Creators
Mark Cendrowski - Chuck Lorre - Bill Prady - Richard Rosenstock
Directors
James Burrows - Mark Cendrowski
Producers
Chuck Lorre - Bill Prady - Richard Rosenstock
Writers
Chuck Lorre- Bill Prady - Richard Rosenstock
Science Consultant
David Saltzberg