Cosmos: War of the Planets (also released in Europe as Year Zero: War In Space) is a 1977 Italian film directed by Alfonso Brescia and starring John Richardson. It is considered a remake of the 1965 film Planet of the Vampires. It was also released as War of the Planets (not to be confused with the 1965 Antonio Margheriti film of that name), and also as Cosmo 2000, as well as Cosmo: Planet Without a Name. The movie has been made public domain and may be freely found and distributed.

It is the first of four films in Alfonso Brescia’s sci-fi series, the others being Battle in Interstellar Space (1978, aka Battle of the Stars), War of the Robots (1978, aka Reactor), and Star Odyssey (1979, aka Seven Gold Men in Space).