The earth has been taken over by the Kriptonian's. Clark Kent (Superman) is the only one who can breathe the air as the evil general Zod is terraforming earth. He is changing the atmosphere to support Kriptonian life. That is why the three have helmets on. Clark is saving the world from the evil Kriptonian's. The three have all accepted to help Clark, but as you can see Milo still want's to be on his own in doing so. Luna is always ver scared and Spyro just want's the addrenalin.
