Stephen Merchant as Dave Gibbs
Dave Gibbs, played by Stephen Merchant, was a tall British man who dated Amy after she breaks up with Sheldon. Dave expressed great interest in Sheldon and Leonard, who he considered physics superstars. In real life, Merchant is the co-writer and -director of the British version of The Office.
John Ross Bowie as Barry Kripke
Barry Kripke was a rival physicist at CalTech who maintained an on-again, off-again friendship with Sheldon. Barry suffered from a case of rhotacism—a speech impediment that caused him to pronounce "R" and "L" as a "W" sound.