Ep. 54: Cosmic Crisis

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The group meets Cosmo, who claims to have come to their planet to find Sonic in order to reclaim the Planet Eggs of various planets from the Metarex. Hearing that, Sonic and his friends decide to depart into space. However, they are once again attacked by Metarex Spike while building the space ship. Sonic is then used as a bullet for the space ship's primary weapon, the Sonic Driver, to defeat Metarex Spike. (Source: Wikipedia)