Season 4 Derek Hale is not quite the man Teen Wolf fans remember.

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Instead, the former Alpha is a teenager once more (as played by Ian Nelson), with none of his adult memories and all the reckless abandon that comes with being a high schooler.

Derek's younger years weren't his finest. He not only listened to Uncle Peter (never, ever a good idea) and let his girlfriend be turned and ultimately killed, but he also naively placed his trust in Kate Argent and unwittingly aided in the destruction of his family. It is this relationship that Kate (Jill Wagner) needed to emulate in the premiere - for reasons unknown - and the reason why she turned Derek into a Benjamin Button experiment.

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So how will Scott's (Tyler Posey) pack get the brooding youth to turn back into his ornery adult self (played by Tyler Hoechlin)? The new Alpha needs to find a cure before little Derek accidentally lets his reckless side wreck havoc on Beacon Hills, although whatever he inevitably told Kate in Mexico will probably do that anyway.

"Episode 2 is all about, 'How do we get him back to normal?'" explained series creator Jeff Davis, according to TV Line. "The mystery of his backstory, what he was up to as a teenager, is always open for debate. And we like Ian Nelson so much, so we were trying to think of a way to bring him back and have some fun. [Laughs] I think people are going to be surprised by what happens in Episode 2."

Find out more about young Derek when Teen Wolf airs Mondays at 10 p.m. ET on MTV. Click the video below to see a preview of "117."

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Teen Wolf, MTV, Television