Five is a novel by Kurt Vonnegut, written in 1969. It is an anti-war science fiction story about World War 2 told by Billy Pilgrim.
Alternative title: The Children’s Crusade: A Duty-Dance with Death
Billy Pilgrim travels through time. He said he was once taken by aliens to their planet Tralfamadore, where he had lived for an uncertain amount of time. Since then, he got the ability of the Tralfamadorians to travel through time and space.