Everyone's Replaceable...Even Abby

S7, E26: With no sign of Abby, The Irreplaceables and The ALDC both find new choreographers to take her place. Famed dancer Cheryl Burke joins the Irreplaceables as they take on their opponents. But, the girls' insecurities and their doting mothers prove to be a struggle for Cheryl and her teaching methods. Meanwhile, the ALDC struggles to stay together and bring Abby back.