Spook Busters (1946)

The Bowery Boys -- Slip, Sach, Bobby, Whitey and Chuck -- start their own exterminating service and get a job, which takes them to a spooky old abandoned mansion in the middle of the night. Meeting up with pal Gabe and his new French bride, the boys are tormented by mad scientists who try to convince them the place is haunted and then kidnap Sach in order to place his brain inside a gorilla.