Security officers who had to deal with the extremely bright scientists who frustrated them, especially Sheldon.
Julio Oscar Mechoso as Officer Hackett in The Bozeman Reaction who Sheldon called when Apartment 4A was robbed.
Marcus Folmar as the Guard in The Excelsior Acquisition who told Sheldon who was in jail he had to use the cell toilet.
Lanny Joon as Officer Shin in The Zarnecki Incursion who Sheldon called when his World of Warcraft account was hacked.
Kevin Brief as Security Guard in The Beta Test Initiation who showed Raj Siri's office in his dream.
Kevin Brief as Security Guard in The Einstein Approximation who showed Leonard where Sheldon was when he was jumping around the ball pit yelling "Bazinga!"
Matt Battaglia as Officer Reynolds in The Bakersfield Expedition who looked into Leonard's stolen car.
Marcus Folmar as Mall Security Guard in The Hesitation Ramification who talked to Raj and Stuart.
David Barrera as Officer Hernandez in The Locomotion Interruption who took care of Sheldon after he was robbed in Kingman, Arizona.
Michael Dempsey as Guard #1 in The Skywalker Incursion who detained Sheldon and Leonard after Sheldon jumped the fence at Skywalker Ranch.
Mark Barrett as Guard #2 in The Skywalker Incursion who told Leonard and Sheldon to come in when the gate speaker wasn't working at Skywalker Ranch.
Marcus Folmar as Police Officer in The Convergence-Convergence who pulls over Howard.
Seth Coltan as Earl in The Monetary Insufficiency who Sheldon meets at the casino where he tries to win money.
Michael Patrick McGill as the Police Officer in The Explosion Implosion who gives Sheldon a speeding ticket.
Eliza Dishku as FBI Special Agent Angela Page The Apology Insufficiency who interviews the guys for Howard's government security clearance.