Short answers, pulled from the story.
The Captain Harlock manga by Leiji Matsumoto began serialization in January 1977 in Akita Shoten's Play Comic magazine and ran until June 1979. The chapters were collected into five tankōbon volumes.
The 1978 Captain Harlock anime television series was directed by Rintaro and produced by Toei Animation. Its score was performed by the Tokyo Philharmonic.
The Mazone are a race of intelligent plant-based beings in female humanoid form who are the primary villains of the original 1978 series. Their home planet was destroyed, and they are attempting to reclaim Earth, which they explored in the mythic past. When a Mazone dies, its corpse spontaneously burns to ash.
Captain Harlock: Dimensional Voyage is a retelling manga illustrated by Koichi Shimahoshi that launched in August 2014 to celebrate the 60th anniversary of Leiji Matsumoto's debut. It features significant plot differences from the original series.
A subtitled version of the 1978 series first appeared in the United States on KIKU, a Honolulu-based Japanese-language UHF station, also in 1978. KIKU-TV then distributed the series to other Japanese-language broadcasters on the mainland in 1979, with KEMO-TV in San Francisco airing it on Sunday nights at 8:00.
Seven Seas Entertainment holds the North American license for the original Captain Harlock manga. A sequel comic by Jerome Alquie, published by Ablaze Comics in collaboration with Matsumoto, began publication in 2021.