Speed and Twinkle awake back into consciousness. They enter the cave behind the Falls. Cornpone Brotch (identified as Cornpone Brush in the previous episode) and his thugs arrive with the treasure. Speed fights off the thugs, while Brotch escapes in the Mach 5.
Using her experience as an escape artist, Twinkle frees herself and Speed from the ropes that bind them. Trixie, in her helicopter, along with Spritle and Chim Chim, spots Brotch in the Mach 5. Speed and Twinkle exit the cave; Trixie picks them up. Brotch enters his secret hideout located in Mount Rushmore. Later that night, Speed and the gang find the secret entrance.
Inside the mountain, Speed and company find collections of stolen art and cars, including the Mach 5. Brotch surrounds them with ferocious black panthers. While Speed fights the cats, Twinkle jumps to safety, hanging from a chandelier. Meanwhile, Trixie races in the Mach 5 to save her friends. Brotch locks them all in the room.
滝壺に落ちてしまった剛とヘレンは、滝の内側の洞窟に迷い込む。そこには、宝を発見したタイガー一味の姿があった。剛たちはマッハ号を連中に奪われ、迷路のような洞窟に置き去りにされてしまう。
