Louisa Rose Allen, known by her stage name Foxes, played a singer in the Doctor Who television story Mummy on the Orient Express. In Mummy, Foxes sang a jazz rendition of the song "Don't Stop Me Now" in a live performance on the Orient Express. The song was later heard again early in the television story Hell Bent.
She is a Grammy-winning recording artist. The BBC released a music video of the performance soon after the broadcast of the episode, marking the first time a promotional video of this nature had been produced by the BBC for the series.