A four-hour miniseries based on Larry Niven’s Ringworld, and Arthur C. Clarke’s Childhood’s End from producer Michael De Luca join the Syfy development slate announced today at its upfront presentation in NY. The network’s previously announced longform projects include Philip K. Dick’s The Man In The High Castle, Stephen King’s Eyes Of The Dragon, and Darkfall.

The network also said today it is renewing its drama series Being Human for a fourth season. The Season 3 finale aired Monday.

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In Ringworld, a team of explorers travels to the farthest reaches of space to investigate a mind-blowing alien artifact called Ringworld, an artificial habitat the size of 1 million Earths. They discover the remnants of ancient advanced civilizations, mysteries that shed light on the origins of man and, most importantly, a possible salvation for a doomed Earth. Michael Perry (The River, Paranormal Activity 2) is adapting the book. The project is a co-production of MGM TV and UCP, with MGM as lead studio; William S. Todman Jr. and Edward Milstein are exec producers. Childhood’s End follows a peaceful alien invasion of Earth by the mysterious Overlords, whose arrival ends all war and turns the planet into a near-utopia. De Luca (The Social Network) is producing with UCP.

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Being Human is one of the network’s youngest- and most female-skewing scripted dramas, with the just-completed Season 3 averaging 1.8 million viewers and 1.1 million adults 18-49. The Muse Entertainment production stars Sam Witwer, Meaghan Rath, Sam Huntington and Kristen Hager as vampires who struggle to suppress their supernatural secrets and temptations and live their lives as close to normal as possible.