Small-time crook Eddie Kearns steals a magic ring that gives him super-strength, but every time he tries to pull off a robbery, he ends up saving people from disaster.; Two shipwrecked fishermen find themselves on an island where a strange old man claims to have discovered the secret of immortality.; Scientist Charles Grayson secretly attempts to improve upon a newly-deployed robot policeman but his lab assistant uses the new robot to frame Grayson for theft.