Season two begins to deal with character growth, including Sheldon becoming more and more obsessive. Leonard and Penny’s relationship takes a turn for the worse when they break up, but this is quickly resolved. Soon their relationship progresses into a stronger relationship than before, while Sheldon and Penny’s friendship slowly begins. In the season finale Penny clues at her true feelings for Leonard. Howard’s character remains similar to that of season one in his attempts to seduce females, managing to start a short-lived sexual relationship with Leslie Winkle in the second half of the season. Meanwhile, Rajesh manages to briefly apologize to Penny for what he did in “The Griffin Equivalency ” without having devoured alcohol. Barry Kripke played by John Ross Bowie induces his first appearance In the series starting with this season, He first appears in “The Killer Robot Instability “.