i know its sometime in season 3 i think its in episode 2 of season 3
They don't find Cosmo excaty. She crash lands into Sonic's planet. Any who the episode they meet is ... Epsiode 53
Who is they and what planet? If Cosmo is "they" she lands on mobius (sonic's world) in ep 53 I believe. If you mean sonic landing on earth then that is episode 1. Other than that in the 3rd series they land on a lot of different planets.
in sonic x you can find it write sonic x episode 18.
Sonic cries in Sonic X episode 52.
If you are talking about the episode of Sonic X where they are filming at a castle, the Episode is "Season 1, Episode 19: Sonic's Scream Test"
Dr. Eggman kept him.
Chris assumingly went back to his home planet.
Episode 67 Of Sonic X (It's Called Teasing Time.)
Episode 67
She Appears in episode 39 of sonic x near the end of the episode.
Episode 72 as a flashback and as a message left on her planet, she also appears in numerous flashbacks that Cosmo has after the episode.
It was the episode named Countdown to chaos