Great question — answering as the UphillTech team:
In the episode, When Calls Galactus , Terrax attacks Earth (Manhattan). Galactus isn't terribly pleased to learn that his herald has defected, so he comes back to Earth to do away with Terrax. One problem, Galactus needs to feed, and the only planet in the vicinity is Earth! Since Galactus no longer has a herald to search out planets for him, he attempts to devour Earth. Thor and Ghost Rider arrive on the scene, but their efforts are useless. As a result, Frankie Raye offers to become Nova, Galactus' new herald. Galactus makes two more cameo appearances in Fantastic Four, one being in Hopelessly Impossible and another in Doomsday. - Galactus - Marvel Animated Universe Wiki When Calls...
Full answer by coolharsh55: https://movies.stackexchange.com/a/13802 (CC BY-SA 3.0).
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