*Wild Arms spoilers! OH NOEZ!*
Wild Arms and Wild Arms Alter Code: F did it. After the Big Bad died, the party was on their way back home when the Dragon came back from the dead and possessed the Big Bad's corpse, and attacked the party. The thing wouldn't survive the trip back home to endanger the world again, it just attacked the party out of spite.
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My Little Phineas and Ferb: Summer is Magic!