Two classic sci-fi novels are in the works at Syfy. The network is developing miniseries projects based on Larry Niven’s Ringworld and Arthur C. Clarke’s Childhood’s End.

Michael Perry (The River, Paranormal Activity 2) is adapting Ringworld as a four-hour miniseries. The story follows a team of explorers that travel to the farthest reaches of space to investigate an alien artifact called Ringworld – an artificial habitat the size of one million Earths. As they crash land on this enormous structure, they discover the remnants of ancient civilizations, technology beyond their wildest dreams, mysteries that shed light on the very origins of man and, most importantly, a possible salvation for a doomed Earth.

For Ringworld fans, this news might cause some deja vu. Syfy previously considered making a Ringworld miniseries under a different production team nine years ago.

Childhood’s End will be executive produced by Michael DeLuca (The Social Network) and follows a peaceful alien invasion of Earth by the mysterious Overlords, whose arrival ends all war and turns the planet into a near-utopia.

The projects will be announced at Syfy’s upfront presentation in New York City today. Ringworld is a co-production of MGM TV and Universal Cable Productions; Childhood’s End is from Universal Cable Productions. Earlier EW reported that the network is also development a gated community thriller from Robert Zemeckis. They join several previously announced Syfy miniseries in development, such as Philip K. Dick’s The Man in the High Castle, Stephen King’s Eyes of the Dragon and the apocalyptic mini Darkfall.