Generate a question that has the following answer: Dr George Randall for the following movie plot: Famed psychic and ghost hunter Agatha Brewster (Minerva Urecal) returns home to the U.S. and is met at the docks by a gaggle of press wanting to interview her. Young news reporter Jeff Carter (Wallace Ford) catches her interest though as he says he is researching a story about the disappearance of her brother, the scientist James Brewster (Bela Lugosi). Agatha was unaware that her brother was missing and agrees to arrange for Carter to visit her at her home for an interview. Agatha immediately goes to see her brother's research partner Dr George Randall (Henry Hall) where she learns that James has not really vanished but in fact has gone into a self-imposed exile as the result of a disastrous experiment. In order to try and prove his evolutionary theories Dr Brewster had injected himself with an experimental serum to turn himself into a 'missing-link' between man and ape. The serum had succeeded in transforming James into an ape-man but with no way of turning himself back into a man the scientist has retained his intelligence but is now trapped in the body of a hideous man-beast. George tells Agatha that her brother keeps himself locked in his secret laboratory at Springfield, the Brewster estate, with a gorilla in a cage as he desperately seeks a remedy to his problem.Meanwhile at the newspaper office Jeff Carter is assigned a keen, female photographer Billie Mason (Louise Currie) to accompany him to the Brewster place for the pre-arranged interview with Agatha Brewster. During the interview both Jeff and Billie hear cries that sound like a gorilla. Agatha dismisses their suggestions but Billie thinks she sees something and takes another photo of Agatha. When the duo return to the newspaper offices Billie develops the photos she took at the Brewster place and sees the ape-like face of James Brewster in the background of one of them.James secretly goes to visit his colleague George Randall to tell him that he has made a breakthrough and believes that a possible cure for his condition lies with human spinal...
A:
Who is involved with Brewster in the experiment?