The Terrible Twos

S1 E4: While out flying on their dragons, the kids stumble upon a small dragon with an injured leg. They bring it back to Berk - no one has ever seen this species before, and everyone loves the new dragon, even Stoick, who names him Torch. Everyone but Toothless, that is, who knows that Torch is the offspring of the deadly Typhoomerang, who is heading towards Berk in search of her missing baby.