2 Fathoms to Heaven? (S01E10)

Accused of being Phantom Zero, Berry and her friends don Deco disguises to evade capture. Simultaneously, the customer center is overwhelmed by incoming reports of Phantom Zero sightings, prompting them to send a search team into the slums. Seeking refuge in one of Finn's hidden spots, Finn tells the detective club that their only chance to prove their innocence lies in venturing to the enigmatic place called Mark Twain, where they aim to catch the real Phantom Zero.