Grizzly II: Revenge (1983)

The huge grizzly enraged by poachers attacks participants and the audience of a rock concert which takes place in national park. Continuation of a horror of "Grizzly". The movie was not officially released though over time the finished shooting material acquired some kind of cult status: except Louise Fletcher who became famous after a role of the nurse in "One Flew Over the Cuckoo's Nest" and David Lynch's favourite Laura Dern, future superstars George Clooney and Charlie Shin played in a picture.