Gregory Peck stars in “Cape Fear” though only when the credits roll. The real star without a shadow of a doubt is Robert Mitchum as Max Cady, the ex-convict who is now seeking revenge against Peck’s Sam Bowden — the lawyer that helped put him away. Mitchum, who also starred in the unprecedented “The Night of the Hunter” as a villainous preacher, seems born to play the bad guy. The scenes where he reservedly watches Bowden’s family at a distance all too close for comfort are disturbing despite us not actually witnessing any brutality from the man himself. The presence of the villain elevates J. Lee Thompson’s “Cape Fear” above the usual trappings of the revenge thriller.