A cab driver uncovers an alien plotting an invasion of Earth. The police won’t believe him, but he foils the invasion on his own and the aliens are killed by their masters for their failure.
Igor is pushed to the breaking point by the incessant demands of Dr. Frankenstein. In the ensuing argument, Dr. Frankenstein has a heart attack and dies. Later, lonely Igor decides to complete his master's experiment and bring the monster to life so that he will now have a servant to order around, but things do not work out as planned.