Bumblebee finds himself befriending one of the most deadliest creatures on planet Hell, thought to be extinct from the galaxy, Bumblebee finds and saves the wounded cybertronian dragon from another type of dragon, brining it back to the ship, Bumblebee gains it's trust while trying to nuse it back to health, while the team gets worried about Bumblebee's odd secretive behavior.

Later, Ratchet would blame Wheeljack (But Astrid was certain it was all Hiccup's fault)