The program is to air April 18 from 7-11 p.m. ET.
Syfy said "Riverworld" is "an epic adventure featuring familiar characters in an unfamiliar world and is based on the popular award-winning series of novels by Philip Jose Farmer."
It is produced by Reunion Pictures and will be distributed internationally by RHI Entertainment.
Reindeer recovered after escaping from Santa during lighting ceremony
Campus cop fatally shoots Texas student during traffic stop