Banana Quest is the final episode of Planet Sheen. Despite many fan speculations, it is not a reunion episode, nor does Sheen return to Earth.
When Nesmith catches a cold, Sheen figures the only way to fix him is by feeding him a banana, so he goes with Doppy and Aseefa to find one. However, Dorkus is in high pursuit of this fruit as well (believing it is some sort of treasure) and will waste no time making sure our heroes don't reach it. Can Sheen find the banana before Dorkus does?
- This marks last time Sheen has appeared in animation, as of the present time.
- This isn't the first Nicktoon to end in a cliffhanger. The first three were Hey Arnold!, 'Danny Phantom and ironically, the original series.
- It is implied in The Tomorrow Boys that Sheen does return to Earth. However, the futures shown by the Chrono-Arch were just predictions, so the future could still change and only Sheen can make it happen. Perhaps Sheen decided to start a new life on Zeenu. There's also speculation that Planet Sheen might be non-canon, but this isn't confirmed right now.
- Sheen is the only character to appear in every incarnation of the franchise.
- There was going to be a reunion special about Jimmy and the others going to rescue Sheen, but due to low ratings, production costs and several writers moving on, it was cancelled. The writers were also having trouble with the script.