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,

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.