There was a lot to take in after Saturday's Doctor Who episode but one hidden gem may have past you by.
A special easter egg was planted for fans during Face the Raven, an episode that caused controversy for showing the death of the Doctor's assistant Clara Oswald.
A box with strange symbols on it appeared in the background of poignant scene between Rigsy and Clara.
Eagle-eyed fans have now pointed out that the symbols on the box are from an entirely different sci-fi franchise, Star Wars.
The hieroglyphic-looking language is Aurebesh, the standard venacular in the Star Wars universe.
When the message on the box is translated it spells DeLorean, the car famously used as a time machine in Back to the Future.
That's one way to link three classic franchises.
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