Splitsboro is the setting for many of the episodes of Sidekick, and where all the action happens.
The city is divided into two major sections: the Nice Side of Town and the Evil Side of Town, hence the name Splitsboro. Naturally, the Nice Side of Town is the good side and is home to the Supers and their sidekicks, and many good-hearted civilians. While the Evil Side of Town is home to villains, scary and dangerous places, and people who are just plain nasty such as Master Xox. These sections are divided only by a run-down train track, and the obvious change in color scheme from one side to the other, where the sky turns from blue to red or vice versa when crossing.
- Splitsboro's name is based on Scarborough, a city near Toronto, Ontario.