Doctor Who season 15's shock finale raises many questions, and one harks back to David Tennant's return to the franchise in a 2023 special.

Most notably, the end credits, which usually read, “Introducing [Actor] as The Doctor,” were different. It only said, “Introducing Billie Piper.” She has yet to be credited as The Doctor — and not just there. The statements from Piper and showrunner Russell T Davies are carefully worded as well.