Sonic's Big Break

"Shadow Knows" or "Sonic the Fugitive" (Tōbōsha Sonikku (逃亡者ソニック?) ) is the 35th episode of

Plot
A mysterious black hedgehog similar to Sonic robs a bank, stealing the Green Chaos Emerald. Sonic is framed for robbing it and G.U.N. forces are chasing him down. Sonic and friends are shocked when they run into the thief: a black hedgehog named Shadow the Hedgehog! Shadow is the Ultimate Lifeform, freed by Dr. Eggman. Sonic and Shadow battle, ending with Shadow making his escape after defeating Sonic, who is then taken to Prison Island. Meanwhile, Shadow meets Eggman on the ARK and introduces him to the Eclipse Cannon, a powerful weapon that can destroy a planet. Shadow says it needs the Chaos Emeralds to be powered, and Eggman decides to use it to either conquer or destroy Earth. Rouge mysteriously appears, offering the Blue Chaos Emerald and her help to collect the remaining emeralds, but what are her real motives?