Robotnik's Revenge

'"Robo'tnik's Revenge " or "The Battle of the Space Colony, ARK" (Supēsu Koronī - Āku no Tatakai (スペースコ ロニー·アークの戦い?) ) is the 37th episode of Sonic X.

Plot
Sonic and co. arrive to stop Eggman from using the Eclipse Cannon to destroy the Earth. Tails gives Sonic a fake Yellow Chaos Emerald, thinking it will destroy the Cannon when placed in with the other Emeralds. Eggman captures Amy as ransom for Sonic giving him the Yellow Emerald. Sonic obliges, but Eggman can tell that it is a fake, and captures Sonic in an exploding capsule, shooting him out into space. Luckily, Sonic is able to Chaos Control back onto the ARK. While Sonic takes on Shadow, the others set out to find Eggman who now has all seven emeralds, and Knuckles takes on Rouge to get the Master Emerald back. When Eggman puts all seven Chaos Emeralds into the Cannon, a recording of Professor Gerald announces that the ARK will now crash into Earth, destroying it completely, as his revenge on all humanity for what they did to Maria.