"Sonic's Big Break" (プリズンアイランドからの脱出,Purizon Airando kara no Dasshutsu?, lit. "Escape From Prison Island") is the thirty-fifth episode of Sonic X as well as the thrid episode of the Sonic Adventure 2 adaption arc.
After Sonic has been imprisoned in Prison Island, Eggman concludes that he must acquire the two Chaos Emeralds located on the island. He, Shadow and Rouge infiltrate the island and Eggman sends Shadow to set a bomb inside the base and Rouge is to find and acquire the Chaos Emeralds. Eggman himself distracts the base's defenses. As Shadow and Rouge head towards the entrance and destroy it, Tails and Amy arrive at the spot with the X-Tornado in an attempt to rescue Sonic. Amy sees Shadow and mistakes him for Sonic and hugs him from his back. As Shadow shows no kind of reaction towards her, Amy realizes that Shadow is not Sonic and concludes that Shadow is the reason why Sonic was imprisoned. Rouge and Shadow head inside and Amy goes to find Sonic. At the same time Chris and Mr. Tanaka arrive on Prison Island with a paddle boat, also attempting to save Sonic and prove his innocence.
Amy finds Sonic in an underwater isolation cell. Amy wonders all the writing in the cell and asks Sonic if he wrote it, but he says they were already there. Amy also mentions that Shadow is also on the island. This gets Sonic's attention and Sonic then breaks from the cell and asks Amy to help him escape. Meanwhile Tails engages Eggman, Rouge finds the Chaos Emeralds and Shadow sets the bomb. Eggman orders him to set the timer into 15 minutes. But Rouge then says that she can be out of that heckish place in five minutes less, so Eggman tells Shadow to set the timer for ten minutes, and then Shadow forgets about Rouge and runs off to find Eggman and escape. But then Sonic shows up and confronts Shadow, then the two hedgehogs battle. Unfortunately their fight is interupted twice, first Rouge and then Eggman telling Shadow that he's not waiting for him or Rouge any longer, and has to escape or be blown to bits.
Chris finally manages to climb on to the island. Eggman then informs Shadow and Rouge that they must escape now. Shadow arrives at the rendezvous location on time, but Rouge gets trapped inside the vault where she found the Emeralds. Sonic and Amy manages to break free and Sonic sees Shadow and goes after him. They have a brief fight but Shadow then escapes. Not to mention the fact that Sonic, Amy, Tails, Chris and Mr. Tanaka were unaware that there was a ticking time bomb on the island. Later, Chris finds Shadow and also mistakes him for Sonic, but realizes that its not him. But he then figures that with Shadow he can prove that Sonic is innocent. But then the bomb is about to go off. Sonic, Tails, Amy and Mr. Tanaka board the X-Tornado to escape. Rouge contacts Shadow for help, and although he was reluctant at first he goes to help her. He uses Chaos Control to teleport himself and Chris to the vault and rescue Rouge, then again to escape the island before the bomb detonates. The bomb finally detonates and Mr. Tanaka believes that Chris died in the explosion, causing him a great grief. But luckily Chris manages to get in Shadow's Chaos Control range with Rouge and all three of them escape in one piece, so Chris doesn't die in the blast.
Difference between Sonic Adventure 2 and this episode
When Amy turns her head to look at the G.U.N robot her legs are coloured peach instead of pink.
Amy mistakes Shadow for Sonic just as she did in Sonic Adventure 2. This is a running gag within the video game series as she also mistakes Silver for Sonic and does the same thing to Sonic as a werehog, only it really was him.