Kerplunk

S2 E13: When one half of the synchronized swimming duo the Aquadolls (guest stars Nora Dunn - "Saturday Night Live," "Sisters," "The Nanny" and Wendie Malick - "Just Shoot Me!," "Dream On," "Frasier") meets with an unfortunate end (murder by shark?), the Darling Mermaid Darlings get a chance to come out of retirement at a traveling water circus. But the surviving Aquadoll may know a little too much about Lily's past. Meanwhile, Ned, Chuck and Emerson go undercover to solve the murder.