Scientist Avery forms a deep emotional bond with an alien creature, Slick, through music. Company director Carter turns Slick into a weapon for profit, triggering a disaster in Los Angeles. After going on a rampage, Slick recognizes Avery, and together they fight against the cloned monsters Carter created. Avery publicly exposes the conspiracy, while Carter mutates himself into the final boss. Slick sacrifices himself to destroy the lab. Everyone believes Slick is dead, but when Avery returns to the ruins, he has been reborn as a tiny life form—and once again shapes his body into a heart. The creature the world once called a monster ends up saving it.
