Fate/Zero is a light novel series that is a prequel to Fate/stay night, taking place around 10 years prior. The story focuses on Kiritsugu Emiya, the Master of Saber and a hitman employed by the Einzbern family to obtain the Holy Grail. The series was adapted into a two season anime that aired from 2011 to 2012.
Episode 18 Edit
A young Kiritsugu enjoys a swim with his friends.
Episode 25 Edit
The Grail is revealed to have granted Gilgamesh a mortal body.