Toontown Online's story centers on an ongoing battle between a population of cartoon animals known as the Toons and a collection of business-minded robots known as the Cogs who are trying to take over the town. Players would choose and customize their own toon and go on to complete Toontasks, play mini-games, and fight the Cogs.

Toontown Online's story centers on an ongoing battle between a population of cartoon animals known as the Toons and a collection of business-minded robots known as the Cogs who are trying to take over the town. Players would choose and customize their own toon and go on to complete Toontasks, play mini-games, and fight the Cogs.