Hiccup finds an injured baby dragon in the woods. Noting that this dragon is an undocumented species, he takes it in for care and closer study. The teens name it a "Typhoomerang", but Toothless appears jealous and does not warm up to the energetic newcomer. Meanwhile, the baby's mother makes her way toward Berk to find her lost son.

Continuing from the previous episode, Hiccup attempts to find evidence that Mildew caused the damage to the village, hoping to exonerate the banished dragons. Meanwhile, Alvin the Treacherous of the Outcast Tribe launches a raid on the Isle of Berk in order to find and capture the "Dragon Conqueror".