Sandoval and Schwartz learn that not all that happens in Vegas stays in Vegas when they surprise their girlfriends with shocking news from their trip. Kristen returns to SUR and apologizes to Ariana, but Ariana is not ready to forgive and forget. Lisa helps Katie examine Schwartz's commitment issues, Sandoval and Ariana take the stage at the Improv, James tries to sabotage Jax's love life, and a visit from Sandoval's mom sheds light on his pre-SUR life.