"This unit is no longer of its own will... Upload in progress."
I was thinking about the episode of Doctor Who called Nightmare in Silver, AND reminiscing about that old Static Shock/Justice League movie crossover thing where the guy basically gets mind controlled by the electronics of Brainiac(1) and THIS was spawned. Toss in a Harry Potter reference and I've got myself another Superhero AU!
OK well, a High School Superhero AU actually, where Jack Frost accidentally got superpowers, and due to his fame and attention, ended up leaving Hiccup in the dust. He didn't mean to of course, and Hiccup is crushing on him so badly (since primary school) that he doesn't know how to confront him about it, so he ends up being alone again. This time, however, unlike when he was younger, he comes across an old computer and, handy with mechanics, he decides he'll fix it up to pass the time. When he gets it working, he finds the PM still works so he starts chatting with someone who's chat popped up. He tries to tell them the original owner f the computer abandoned it, but the person keeps talking to him, and for some reason he stays. The person (Known as P. Black) keeps talking to Hiccup through the chatbox and after a while, Hiccup spills his darkest secrets and heart out to this stranger. Insert Voldemort's Diary reference at this point, because the more he talks to the stranger, the more angry he feels about everything else, and the more the computer is actually fusing with him, until he turns into what you see above.
Then blah blah blah, eventually Jack has to stop the virus from overwhelming Hiccup etc etc. and taking over the world.