User blog comment:MrAnonymous/I think I know what the lizard thing is./@comment-68.3.153.203-20120612091912

If you people don't like spoilers you wouldn't be asking these questions so im gonna rule out a couple things, the new creature isn't lydia or jackson for it is a new character that will be revealed in time, and here is the reason why i say that. Jackson's bite didn't work cause of that scratch derek gave him in season 1 "magic bullet" when derek was poisoned, and you could see that it messes jackson up throughout the rest of the season, the trailer tells about the 2 creatures a new wolf and a new creature the lizard, the new wolf is jackson for when stiles says its "an abomination" they are talking about are boy jackson who's bite has just sinked in making him into that abomination. Lydia is just not the creature you'll find that out too.