Jonathan Nolan and Lisa Joy, the creative team behind the hit HBO series Westworld, have signed a massive first-look TV deal. And it's not with HBO.

Deadline reports it's Amazon Studios who have signed the deal with the married couple/producing partners. The deal is officially with their production company Kilter Films, and is reportedly one of the most valuable deals in Hollywood, which is expected to last at least five years.

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The deal will see the pair bring new material to the streaming service, Amazon Prime. Nolan and Joy have actually already been working with Amazon, developing a sci-fi drama series called The Peripheral. This does not mean the duo will be leaving Westworld, however. It's been reported the deal allows them to continue their work on the HBO series for however long the series will run on the cable network.

“Jonah Nolan and Lisa Joy are two of the most talented and inventive creators in the business,” Amazon Studios Head Jennifer Salke said. “They have mastered the art of working in tandem as well as individually on so many fantastic projects across film and television. They each bring their own unique storytelling abilities to the partnership, creating unforgettable characters in addictive and compelling worlds. We are ready to jump right in and can’t wait to deliver their future projects to our Amazon Prime Video audience.”

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Developed for television by Jonathan Nolan and Lisa Joy, Westworld stars Evan Rachel Wood, Thandie Newton, Rodrigo Santoro, James Marsden, Jeffrey Wright, Tessa Thompson, Luke Hemsworth, Jimmi Simpson, Aaron Paul, Anthony Hopkins and Ed Harris. The series is set to reenter production this spring.