Ep 5. A Wicked Beast's Roar

Kiritsugu and Saber's quest to win the Holy Grail War continues in Fate/Zero season 1 episode 5, "A Wicked Beast's Roar." The episode begins with Kariya using his insect familiars to eavesdrop on Tokiomi and Archer's conversation, revealing that they plan to take down Saber with a surprise attack. Meanwhile, Kiritsugu and Irisviel investigate a supposed gas leak at a hotel, only to discover that it's a trap set by Caster.

Caster and his master, Ryuunosuke, have been causing chaos throughout the city, killing innocent people in horrific ways as part of their insane quest for the Holy Grail. In this episode, they set their sights on Saber and attempt to lure her into a trap by unleashing a monstrous creature known as a "wyvern." The wyvern is a fierce beast with massive wings and a deadly roar, and it quickly proves to be a formidable opponent for Saber.

As the battle rages on, Kariya intervenes and tries to take down Tokiomi, hoping to put an end to the Holy Grail War once and for all. But he's quickly overwhelmed by Tokiomi and his powerful magecraft, and it becomes clear that Kariya is no match for his opponent.

Meanwhile, Kiritsugu and Irisviel run into trouble of their own when they're attacked by Caster's familiars. Irisviel is injured in the scuffle, and Kiritsugu is forced to use his magical bullets to take out the attacking insects. He also realizes that Caster is planning to sacrifice innocent children as part of his twisted quest, and he vows to put a stop to him at any cost.

Back at the battle between Saber and the wyvern, things look dire for the King of Knights. The wyvern proves to be too strong for her to take down, and she's knocked to the ground by its powerful attacks. But just when all seems lost, Lancer arrives on the scene to lend a hand. He uses his powerful lance to take down the wyvern, saving Saber and earning her gratitude.

The episode ends with Saber and Lancer forming an unlikely alliance, as they both begin to question the morality of the Holy Grail War and the lengths that people will go to in order to win it. Meanwhile, Kiritsugu is forced to make a difficult decision when he discovers that Caster has taken a group of innocent children hostage. He must decide whether to sacrifice the lives of a few for the greater good, or risk letting Caster and his twisted master continue to cause chaos in the city.

Overall, "A Wicked Beast's Roar" is an action-packed and emotionally charged episode of Fate/Zero, with plenty of thrilling battles and complex character dynamics. It sets the stage for even more dramatic confrontations to come, as the various factions in the Holy Grail War continue to clash in their quest for power and dominance.