When Dave hires someone to help with a backlog of filing, Beth couldn't be happier -- until she learns the temp is her childhood friend, Sandi Angelini. In a private moment, Beth complains that Sandi used to copy everything she did, from her hairstyles and mannerisms, to stealing a boyfriend. Lisa and Dave think she's just being paranoid, so Beth suggests an experiment which could prove her claim. Meanwhile, after leaving his identification card at his desk, Bill is denied entry by a pair of the building's security guards. To prove her point, Beth suggests to Sandi that she is romantically interested in Matthew. As predicted, Sandi then makes an obvious pass at him as well. And while Matthew isn't sure what to make of all the attention, Dave and Lisa see that Beth was right. Meanwhile, as the security guards continue to foil Bill's attempts to sneak inside, Catherine decides to have some fun by getting into the act, too. Disgusted by Sandi's flirtatious behavior, Beth ups the ante in her little game by giving Matthew a big kiss. So Matthew seeks Lisa's advice on how to handle the two women who seem to be in love with him. But when Beth decides to put an end to the charade and confronts her about the mimicry, Sandi finally admits she only did it out of envy and admiration. Upon making up, they each let Matthew down gently with some help from Dave, while Bill recovers his ID for the benefit of the guards, only to discover it's expired.