Hookfang's Nemesis is a minor antagonist of the TV series, Dragons: Race to the Edge and the main antagonist of the episode, Total Nightmare.
After Hookfang having partnership with his mate, Girl-Hookfang, Snotlout saw Hookfang getting weary, because of his nemesis, which is a Titan Wing Monstrous Nightmare, who wants to steal Girl-Hookfang from Hookfang. The dragon riders started to fight Hookfang's Nemesis and Snotlout said that it will only be him and his dragon, Hookfang who will fight, in order to show dominance over the love-rival. The fight started and although, Hookfang's Nemesis is stronger, Hookfang is more agile and finally defeated his nemesis and that defeated dragon flew away.
Hookfang's Nemesis is a Titan Wing Monstrous Nightmare, which is the final and most powerful stage in the dragon life cycle. He appeared to be bigger, darker red and has thicker stripes.
What he really wants is to find a mate, so he is willing to hurt any weaker male in order to steal the mate. He is very brutish to Hookfang by treating him as a weakling.