The Killer Robot Instability — [s2e12]

: Leonard guilt-trips Penny into apologizing to Howard. When she does, Howard attempts to take advantage of her kindness by going in for a kiss, leading Penny to punch him in the face. Notable Firsts and Trivia

: The guys build a 110-pound fighting robot named M.O.N.T.E. (Mobile Omnidirectional Neutralization and Termination Eradicator). After an obnoxious colleague, Barry Kripke , challenges them to an unsanctioned duel, the guys' robot is brutally destroyed by the "Kripke Killer" because Howard—the team’s engineer—is absent. [S2E12] The Killer Robot Instability

: The episode is often cited as a turning point for Howard’s character, offering a rare glimpse into the insecurity behind his "creepy" persona. : Leonard guilt-trips Penny into apologizing to Howard

Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg,

: This episode marks the first appearance of Barry Kripke , played by John Ross Bowie .

: This is the first time Howard's mother speaks without shouting. Production Credits Director Mark Cendrowski Writers Bill Prady, Richard Rosenstock, Steven Molaro, Daley Haggar Starring