Sonic X
After getting stranded on Earth, Sonic and his friends team up with 12-year-old Chris Thorndyke to collect all the Chaos Emeralds and defeat the evil Dr. Eggman.

Season 3 · Episode 22 ·
Eye Spy
When the team discovers that Cosmo's brain is emitting a signal to the Metarex, they plan on trying to eliminate the signal, except that the signal is connected to the part of her brain that translates sounds and sight. While Tails and Cosmo are torn about this, Knuckles pushes for the surgery.
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Episode 22 of season 3 of Sonic X: “Eye Spy”. Aired 2009-08-06. Watch it online free on ZapFlix.