7x18 - Shark Tank

A 16-year-old environmentalist has an eco-friendly way to say goodbye to plastic bottles; a former soap star villainess wants the sharks to make a deal with her one-piece swimsuit that can keep you sun-safe and stylish; two men pitch an app that creates exercise playlists for the everyday person; and a man promises to expose the hidden, dirty secrets lurking in your mattress. Plus, a follow-up on Signal Vault that protects consumers from crowd-hack-attacks, in which Lori Greiner and Robert Herjavec invested in during Season 7.