What is Dragon Ball Z?

Context: Dragon Ball Z is a Japanese anime television series produced by Toei Animation. Part of the Dragon Ball media franchise, it is the sequel to the 1986 Dragon Ball anime series and adapts the latter 325 chapters of the original Dragon Ball manga series created by Akira Toriyama. The series aired in Japan on Fuji TV from April 1989 to January 1996 and was later dubbed for broadcast in at least 81 countries worldwide.

Dragon Ball Z continues the adventures of Goku in his adult life as he and his companions defend the Earth against villains including aliens, androids, and magical creatures. At the same time, the story parallels the life of his son, Gohan, as well as the development of his rivals, Piccolo and Vegeta.

Answer: Dragon Ball Z is a manga and an anime about an alien man who comes to Earth named Goku. It picks up the show from its prequel Dragon Ball and is analogous to Superman. Goku  is a Saiyan, a race of fighting aliens, and as an adult, he and his friends, the Z fighters, defend the Earth from other Saiyans such as Raditz and Vegeta, alien overlords such as Frieza, androids such as Cell, and magical creatures such as Majin Buu.