Kerplunk | [s2e13]

: Vivian sees the ad in the paper while she and Lily are alone on Chuck’s "half-birthday".

: Ned and Chuck investigate a murder involving a rival synchronized swimming duo (the Aquadolls vs. the Aquaberries). Meanwhile, Lily and Vivian (the Darling Mermaid Darlings) face their past when they decide to perform again. [S2E13] Kerplunk

The reference to a "" in your query likely refers to a specific plot point in this episode: Vivian Charles spots an advertisement in the newspaper for a synchronized swimming act called the "Aquaberries," which prompts her and her sister Lily to come out of seclusion. Episode Details : Vivian sees the ad in the paper

: Because the show was canceled, this episode had to "race through plot threads" to provide some closure, though it famously ended on several unresolved cliffhangers. Meanwhile, Lily and Vivian (the Darling Mermaid Darlings)