Good gorillas meet bad gorillas while human beings search for treasure in this jungle advnture saga. R.B. Travis (Joe Don Baker) is the ruthless head of Travi-Com, a telecommunications firm on the cusp of a major breakthrough in laser communications technology. However, Travis needs diamonds to finish the project, so he sends a group of men to Zaire, where he's told that a large supply of the gems can be easily found. When the men go missing, Travis sends his trusted assistant Karen Ross (Laura Linney), a one-time CIA associate, into the jungle to find both his staff and the jewels. Hoping to keep her mission a secret, Karen travels to Zaire in the company of Peter (Dylan Walsh), a researcher on primate development who is hoping to return Amy, a gorilla who has been taught sign language and can "speak" English with the help of a glove-controlled computer device. Also travelling with them is Herkermer (Tim Curry), a Romanian with a secret agenda: he's convinced that Amy can guide him to the Lost City of Zinj, where he believes that King Solomon's Mines are located. Upon arrival, the group is met by Monroe Kelly (Ernie Hudson), a self-described "great white hunter who happens to be black," and they discover that the jungle holds a menace that they weren't counting on: a tribe of bloodthirsty gray gorillas. Congo was based on the best-selling novel of the same name by Michael Crichton.