It's now summertime which gives the gang a chance to have fun in the pool. But Puppycorn is afraid of the deep end, so Unikitty and the rest try to help him and show him how cool the deep end is, but Master Frown is destined to make things worse to increase Puppycorn's fright.

When everyone starts experiencing dangerously low boredom levels, Dr. Fox introduces her new invention: the P.L.O.T. Device, which can make anything exciting happen, but it starts getting out of control when it's used too much.