Syfy will debut both Childhood's Endand The Expanse on Monday, Dec. 14, the network announced on Wednesday.

A six-hour limited series, adapted from Arthur C. Clarke's novel, Childhood's End will also air on Tuesday and Wednesday, Dec. 15 and Dec. 16 at 8/7c. Mike Vogel, Charles Dance, Yael Stone and Julian McMahon star in the drama which takes place after a peaceful invasion of Earth by aliens who promise to eliminate poverty, war and sickness, but whose intentions aren't quite what they seem.

The Expanse will follow Childhood's End at 10/9c for a two-night premiere on Dec. 14 and Dec. 15. The following week, it will continue to air on Tuesdays at 10/9c.

Set 200 years in the future, The Expanse follows a detective (Thomas Jane) and a rogue ship captain (Steven Strait) as they team up to find a missing young woman and unravel the largest conspiracy in human history.