[s2e12] The Killer Robot Instability -

: 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

: This episode marks the first appearance of Barry Kripke , played by John Ross Bowie . [S2E12] The Killer Robot Instability

S 2 E 12 The Killer Robot Instability Analysis. : r/bigbangtheory : Leonard guilt-trips Penny into apologizing to Howard