The Big Bang Theory (Ep. 624) "The Bon Voyage Reaction"
When Leonard receives an exciting opportunity to work overseas, Penny and Sheldon are thrown for a loop.
The Big Bang Theory (Ep. 623) "The Love Spell Potential"
When the girls' trip to Vegas falls through, the guys invite them to play Dungeons & Dragons; Raj and Lucy go on an awkward date.
The Big Bang Theory (Ep. 622) "The Proton Resurgence"
Leonard and Sheldon hire the host of their favorite childhood TV show to perform; Raj leaves his dog with Howard and Bernadette.
The Big Bang Theory (Ep. 621) "The Closure Alternative"
Amy tries to help Sheldon get over his need for closure when his favorite TV show is canceled; Raj discovers a secret about Lucy.