A frantic telegram arrives from an old friend: Chief Mbonga. “The forest screams. The elephants attack their own. Come back before the spirit of the jungle dies.”

Years after leaving the jungle for civilization, an older, weary Tarzan is forced to return when a mercenary group uses his old home as a testing ground for a sound weapon that drives animals mad. To save both worlds, he must shed the “gentleman” and let the beast roar again.

London, 1931. Rain slicks the cobblestones. John Clayton III, Lord Greystoke (Tarzan), sits in a leather chair, staring at a fireplace. He wears a tailored suit, but his eyes are distant. His wife, Jane, touches his shoulder. He flinches—still hearing phantom vines rustling.