London Underground ticket inspectors will ruin the ending of Star Wars: The Force Awakens for those travelling without a ticket.

The force is strong on the London Underground, as ticket inspectors come up with the ultimate threat for fare-dodgers.

On at least one tube station sign, Transport for London told ticketless commuters that not only would they face a fine, but they'd be told spoilers from the ending of Star Wars: The Force Awakens.

"Anyone caught travelling without a valid ticket or Oyster will be told the ending to the new Star Wars (and also get a penalty fare)," read a sign at Canonbury station in the northeast of the city.

However, it's not clear if the message got through: traveller Royston Deitch, who photographed the sign, told The Independent: "Everyone seemed in a rush at the station so I'm not sure how many other people saw it."

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London's other Tube stations have also got into the spirit of the record-breaking blockbuster. A Yoda quote was snapped at the Earl's Court station last week.

Star Wars: The Force Awakens set a new record, raking in US$529 million (NZ$774 million) in ticket sales worldwide over its opening weekend.

Fans embraced the new instalment in the series: A clash between good and evil in a galaxy far, far away. Thousands gathered for a friendly lightsaber battle in downtown Los Angeles on Friday, and moviegoers in cities such as Berlin and Paris arrived at screenings wearing Stormtrooper costumes, Jedi robes and Darth Vader masks.