Fringe‘s Peter Bishop has put himself on the train to “Observerville,” as Joshua Jackson puts it, by installing one of the chrome domes’ piece of tech into his own head — and in doing so has basically betrayed his loved ones.

“He’s not in a good place,” Jackson shares in the exclusive video below. “He’s doing exactly the thing he promised both Walter and Olivia that he wasn’t going to do, to abandon them and be hell-bent on avenging the death of his daughter.”

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What’s more, his timing could not have been worse. After a period of estrangement, “Olivia finally decided to reach out,” Anna Torv notes. But with Peter now a bit of a hybrid, “That little journey is going to be a tough one.” As Jackson previews, “You realize that Peter, as we know him, is very rapidly slipping away.”

John Noble says the tragic twist paves the way for Jackson to finally do what all of his castmates have done in seasons past — basically inhabit a second character — and hails his TV son’s performance.

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Press PLAY below, then tell us: What do you think of Fringe‘s latest final-season wrinkle?