August 12, 2015 at 06:47 PM EDT

Syfy announced premiere dates for new dramas The Expanse and Childhood’s End at the Television Critics Association’s semi-annual press tour on Wednesday.

The Expanse will kick off with a two-night premiere event starting Monday, Dec. 14 at 10 p.m. ET and continuing on Tuesday, Dec. 15 at 10 p.m. ET, before moving to its regular Tuesday at 10 p.m. ET timeslot for the remainder of its 10-episode first season.

Set 200 years in the future after mankind colonized the solar system, The Expanse tells the story of a hardened detective (Thomas Jane) and a rogue ship’s captain (Steven Strait) who come together for what starts as the case of a missing young woman and evolves into a race across the solar system to expose the greatest conspiracy in human history.

The six-hour television event Childhood’s End will air over three consecutive nights starting Monday, Dec. 14 at 8 p.m. ET, running two hours each night through Wednesday, Dec. 16.

Childhood’s End follows the peaceful invasion of Earth by the alien Overlords, who promise to eliminate poverty, war and sickness, ushering in an age of peace. But the Overlords insist on hiding their appearance, making some on earth question where there’s a price to pay. As the truth about the Overlords’ intentions are revealed, humanity will discover its actual destiny may actually be a nightmare, instead of a dream.

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