The Oscar-winning actor Jim Broadbent, the comedian Eddie Izzard and the Scottish actor Joe McFadden appear in the three-and-a-half-minute film, which will run in cinemas across Britain in November.
HHCL/Red Cell created the movie, which aims to motivate so-called "armchair activists" - people who want to do something to help protect the environment but don't know what or how.
Called "Alien Invasion", the film shows a group of aliens considering a takeover of Earth. They are divided in opinion over whether the planet is a worthwhile investment or beyond help.
The plot underscores the pressure group's message that everybody can help the environment through everyday buying decisions and basic lifestyle choices.
Steve Henry, the creative director at HHCL/Red Cell who collaborated on the script, said: "This is a revolutionary way for charities to communicate with audiences, offering a novel, enjoyable way of promoting a better future. It shows Greenpeace is open, human, and has a sense of humour."
The film's cast, its director, Hank Perlman, his production company, Hungry Man, and the post-production company, The Mill, all gave their services free. It will be distributed via an arrangement with Pathe Films.
The Greenpeace initiative mirrors a move by BMW earlier this year when it screened its own all-star mini-film, "Beat the Devil", to support the launch of its Z4 roadster.
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