Whitney can't hold back her excitement at the opportunity to reconnect with her half-sister, but when the reason behind Lauren's visit is revealed, Whitney realizes she must support her sibling's life-changing decision. Meanwhile, Alex and Mark try to cheer up a newly dumped and depressed R.J. after discovering him soaking in his bathtub.

What starts as a little friendly competition at Low Bar ends on a sour note when Whitney goes one step too far by showing her backside to the group. Alex is angry at Whitney's actions, but in order to show her he's not uptight, he tries to take a compromising photo of himself but is embarrassingly interrupted by Roxanne and Lily. Meanwhile, Mark discovers R.J. is deathly afraid of spiders.