Tensions run high as a doubtful Julie lets Mary babysit Erica, only if Mary has no visitors. But when Frankie comes by and begs Mary to take care of her baby Mercy, Mary can't resist helping her. Then, Mary is then caught with an open bottle of beer while babysitting. Meanwhile, Lucy volunteers to supervise Ruthie's sleep over, and to watch the twins. Simon is on a quest to change his image, and does this by piercing his ear. Matt pursues a woman who wants nothing to do with him. Also, Eric and Annie clash with Mary's disreputable friends.