Doctor Henry Jekyll (John Barrymore) is praised for his enthusiasm for science and his selfless acts of service. When he is criticized for his reluctance to experience the more sensual side of life, he becomes fascinated with the idea of separating the two contrasting sides of human nature. After extensive work in his laboratory, he succeeds, creating an alter-ego for himself, whom he names Mr. Hyde. Soon, Hyde's personality begins to dominate Jekyll's...

Their Uncle Dan is still missing and Carter and Isabelle are starting to worry, especially after they receive a threatening call from the computer hacker--and he challenges them to match wits with him in Treasure Island.

Young Jim Hawkins sets off to find the missing treasure, accompanied by Captain Smollett and the evil Long John Silver.