In The Big Bang Theory season 2, episode 22, "The Classified Materials Turbulence," Howard faces a career crisis over a flawed space toilet design, while Leonard and Penny's relationship faces complications after she accidentally calls her date by Leonard's name. The episode features an all-night, chaotic attempt to fix the engineering issue. Read the full recap at TV Fanatic . The Big Bang Theory Season 2 Episode 22 Recap - TV Fanatic