DAY ONE EDITION COMES WITH: The Callisto Protocol, Retro Prisoner Character & Weapon Skins.HORROR ENGINEERING: The Callisto Protocol is a next-generation take on survival horror from the mind of Glen Schofield. Blending atmosphere, tension, and brutality with terrifying moments of helplessness and humanity, The Callisto Protocol immerses players in a pulse-pounding story where unspeakable horrors lurk around every corner.UNCOVER THE SECRETS OF THE UNITED JUPITER COMPANY: Set on Jupiter's dead moon Callisto in the year 2320, The Callisto Protocol casts players as Jacob Lee, an inmate in Black Iron Prison. When a mysterious outbreak throws the moon into chaos, Jacob must face his darkest fears to defeat the bloodthirsty creatures that stalk him as he unravels the dark mysteries at the heart of the powerful United Jupiter Company.MASTER BRUTAL, STRATEGIC COMBAT: The Callisto Protocol challenges players to master a thrilling blend of hand-to-hand and ranged combat, including a unique gravity weapon once used by Black Iron guards to control the prison population. Players will be forced to get up close and personal with their grotesque opponents, hacking off limbs, blasting off legs, and getting creative with whatever is at their disposal to survive each life-or-death encounter.EXPERIENCE THE ISOLATION OF JUPITER'S DEAD MOON: One of the most hostile, isolated environments in the universe, Callisto looms large over Jacob's desperate struggle to survive. Players must not only contend with the horrors of Black Iron Prison, but also the centuries-old secrets that plague Jupiter's long-dead moon, both above and below the surface.