After partnering with Netflix on this summer’s Zoo, CBS is back in business with its original streaming partner on summer drama series, Amazon, which helped CBS create a new business template with the deal for Under the Dome, later used for Extant. The new multi-year, multi-series agreement makes Amazon Prime Video the exclusive subscription streaming home for three new CBS summer series through 2018. Next summer’s BrainDead will be the first new show included in the deal, joining Under The Dome and Extant, which are available under the current agreement. Following the same model as the existing CBS summer drama series on Amazon, BrainDead will be available for Prime members to stream four days after the network broadcast. The deals, paired with international pre-sales, had made CBS’ summer drama series — all owned by CBS — profitable for the company regardless of their ratings performance on the network.

“Prime members have loved having access to series like Under The Dome and Extant just four days after broadcast, and we’re excited to continue to offer in-season availability of more great CBS summer series over the next three years,” said Brad Beale, Amazon VP of Digital Video Content Acquisition.

BrainDead is a comic thriller from The Good Wife producers Robert and Michelle King. Set in the world of D.C. politics, the series follows a young fresh-faced Hill staffer (Mary Elizabeth Winstead) getting her first job in Washington, D.C. and discovering two things: the government has stopped working, and alien spawn have come to Earth and eaten the brains of a growing number of congressmen and Hill staffers.

The new deal also will extend and expand CBS and Showtime titles available to Prime members, which include Medium, The Tudors, The L Word, the original Twin Peaks series, America’s Next Top Model, I Love Lucy, Penn & Teller, The Amazing Race, MacGyver, Brotherhood and Sabrina, The Teenage Witch. CBS Films available for Prime members include Inside Llewyn Davis and Pride, among others.