It’s not really a crossover, sorry.
As Nero becomes increasingly confused with Neo, Dylan and Kiyan discuss The Romans, written by Dennis Spooner and aired in January and February of 1965. Also, massive River Song spoilers in this episode, specifically, most of reboot season 6.
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The Doctor Who title music was originally composed by Ron Grainer. The version used in this episode was arranged by Delia Derbyshire.