Minato's Death

is episode 350 of the Naruto: Shippūden anime.

Summary
The Konoha-nin posted on the outskirts of the village as guards are attacked by ninja disguised as members of Iwagakure. Their assault is quickly ended when an ANBU detail arrives on the scene and chases them away. Kakashi pursues them and kills them all using his Chidori. News of his actions reach a perturbed Minato who speaks with Kakashi, informing him that Kushina was pregnant and asking that Kakashi act as her guard due to the complications that arose from her also being a jinchūriki. Dutifully taking the mission, Kakashi informs Rin of the new developments unbeknownst to him that the masked man was eavesdropping. The event that followed culminated in the Nine-Tails wreaking havoc on the village before it was sealed within the newborn Naruto. Shortly before dying, Kushina tells Hiruzen the child's name and pleads with him to protect him — an oath which the Third swears to. With the Hokage seat once again vacant, Hiruzen resumes the post until they can groom someone else for the post. Kakashi is inveigled by Danzō to join Root, and upon reporting to the war-hawk encounters another ANBU with the ability to use Wood Release.