There are cameos for real-life BBC Eurovision hosts Rylan Clark and Graham Norton, and villains who almost share the names of James Bond assassins Mr Wint and Mr Kidd. "Who" fans will also note that singer Cora Saint Bavier (Miriam-Teak Lee) is representing Trion, the homeworld of Fifth Doctor companion Vislor Turlough.

Spoilers for “The Interstellar Song Contest.” No, really, spoilers from here on out. Much like Eurovision itself, that was a lot, wasn’t it? And much like every other episode this season, “The Interstellar Song Contest” was overstuffed,

Now, the overnight ratings have been confirmed for The Interstellar Song Contest, with the episode being watched by 2.57 million viewers. The overnight viewership for the episode was the highest for the season thus far, beating the previous highest-rated episode, The Robot Revolution, which was watched by 2 million viewers.