A series of ads for action fantasy prequel introduce the Servants Saber, Rider, Assassin and Caster.
The Fate/Zero TV anime is based on Gen Urobuchi's (Puella Magi Madoka Magica, Blassreiter) novel, which acts as a prequel to Type-Moon's Fate/Stay night visual novel software. It sets the stage for the war in the series, taking place a decade prior.