Despair, delight, utter exhaustion at the show’s increasing use of nostalgia: Guardian readers’ responses to the latest twist in the Timelord saga vary wildly

When I saw Billie Piper’s face, it felt as if I had been subconsciously waiting 20 years for this moment. It was joyous and completely overwhelming. It was that same iconic Rose Tyler smile that got me – the one we last saw when she was reunited with the Doctor in 2008. Like many others, I was a child when I was introduced to Doctor Who in 2005 and it was unquestionably Rose Tyler who hooked me in, and that transcendental love story. I have been a fan of Piper ever since and hope, for old times’ sake, we get to see her again with David Tennant’s 14th Doctor. Steph Braithwaite, 31, community relations manager, Toxteth, Liverpool

I heard a rumour about the Doctor regenerating into Billie but quickly dismissed it as a joke, so I was pretty surprised to see her pop up. Note that in the credits she wasn’t listed as the Doctor. If the rumours are true, the show is likely to be rested for a good few years. So I’m thinking that getting Billie was probably a last-minute inclusion to get everyone talking and ensure the show didn’t go out with a whimper. As for the future of the show, stick it on at 9pm. I think it needs to appeal to an older audience (like me) – I’m thinking more like X-Files. Make it dark, scary and occasionally funny. Just not sexy, please. Mike, 48, product designer, Montreal