2 Fathoms to Heaven? - S1.E10

After being suspected of being Phantom Zero, Berry and the club use Deco disguises in order to escape. Meanwhile, the customer center is in a frenzy, thanks to reports of Phantom Zero that they're receiving from all over the place. They dispatch a search team to the slums. Finn and the detective club take shelter in one of Finn's secret hideouts, with Finn stating the only way they can clear their names is to head to the mysterious location known as Mark Twain, and apprehend the true Phantom Zero.