As the Off-Colors graduate from Little Homeschool, Steven learns that Sadie Killer and the Suspects have broken up to pursue their own interests; Sadie is now dating a new partner, Shep; and Lars has decided to leave his bakery in Beach City and return to space. Worried that his friends are drifting away from him, Steven literally tries to keep everyone together.

Steven resigns from Little Homeschool, and unhealthily takes up gardening as a hobby. He accidentally brings a cactus to life, which soon begins to look like and imitate him by repeating his innermost feelings. Things get out of control when "Cactus Steven" grows into a monster while acting out Steven's aggression.

Joe attempts to keep things platonic with Love and keep his nose out of Ellie's business. But his instincts soon get the better of him.

The Hockey Players start a club for men. The skids go to the city.

John's predicament goes from bad to worse, sending Judy on a frantic race across the planet. Penny spies on Smith with help from an old friend.