Sonic X - Vol. 1

Episode 1 - "Supersonic Hero Appears!":
Sonic and Dr. Eggman fight over the possession of the seventh Chaos Emerald. The Chaos Emerald is a legendary stone that is said to give its possessor the power to rule over the entire world. As Sonic storms into Dr. Eggman's base all seven Chaos Emeralds are brought together, causing a large-scale Chaos Control warp in space, blowing away Sonic and his friends.

Episode 2 - "Escape From Area 99":
Sonic finds out on TV that Cream and Cheese are being held captive at a military research centre called Area 99. He attempts to go and rescue his two friends who are being scientifically examined.
Sonic is concerned about whether Knuckles and Amy are in this world and of course if they are here is Dr. Eggman here as well!