Season 2    Episode 40
November 6, 1987    25m    TV-Y7
Subway workmen accidentally open a door that unleashes all of the evil from hell and it begins to spread across New York, primarily through the subway tunnels. This time, the Ghostbusters may not come back alive!

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Cast of Knock, Knock
  • Arsenio HallWinston Zeddemore (voice)
  • Maurice LaMarcheEgon Spengler (voice)
  • Lorenzo MusicPeter Venkman (voice)
  • Frank WelkerRay Stantz (voice) / Slimer (voice)
  • Laura SummerJanine Melnitz (voice)

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