While on a springtime run, Sonic stumbles upon a Chao Garden with a problem: they've got a Chao Egg that won't hatch, and a bossy Shadow Chao intends to get the new baby Chao out, one way or another!

It's chow time in the Chao Garden! Sonic is helping the Chao get a bite to eat until the resident trickster, a Shadow Chao, decides to make trouble...

It's a special day for the Chao; a whole bunch of little animals have come to visit! It's time for the Chao to pick our their favorite traits and transform. But when the Shadow Chao gets a bit too greedy, they run the risk of becoming something terrifying...

To beat the heat, the Chao are dancing and making music with Sonic in the shade. The Shadow Chao wants to crash the party, but even their shenanigans can't stop this jam session!

When all the Chao in the garden decide to run a race, the Shadow Chao confidently blazes in. Will pride be enough to fuel their path to victory? Can Sonic help them learn a little humility?

As the leaves start to change, the Shadow Chao is busy training, and they've gained a fan. Will the Shadow Chao push them away, or finally begin to soften up?

As winter closes in on the garden, the evil Dr. Eggman attacks, determined to level the Chao's precious forest for lumber. But Sonic is ready for him... or at least he thinks he is.

The battle against Dr. Eggman isn't going well. Will Sonic and his Chao friends be able to turn the tables on the doctor and save the forest?