When a mysterious alien artifact lands on Earth, Commander Nicole Breckenridge (Katee Sackworth) must lead humanity's first interstellar mission to its planet of origin while her husband (Justin Chatwin) stays on Earth and tries to make first contact with the artifact. Extraterrestrial explores the miracle of life, how precious it is in a universe that has little to no life, and the lengths we will go to to protect what we love.