Tonton Streaming Ghostbusters (1986) S1E39 - Train To Doom-De-Doom-Doom

The Ghostbusters receive a call from Prince Otis of Petronia who asks them to protect the Royal Crown of Petronia situated in England's Tower of London. Prime Evil wishes to obtain the crown so that he can take advantage of the Royal Law which dictates that he must be declared King of Petronia!