Ask a question in the box below, or search using the box above.

As you enter your question, our massive, TARDIS-sized computers will search out other similar questions. So be sure to check the list that pops up before asking your question. Once you've decided that your question has not been asked before, push the not-so-threatening blue button below.

If you want to ask questions needing speculation or people's opinions, please do it in our Watercooler forum, not here. The main Q&A space is for questions with definitive factual answers. Thanks!

To avoid spoilers in the main Q&A section, please do to not post information about stories that have not been released in the UK, or ask for information about stories that have not yet aired there.

Because, as stated by Steven Moffat and Billie Piper in interviews, Rose's story concluded in "Journey's End" and to bring Rose back would have lessened its impact (Rose's cameo in "The End of Time" doesn't count). However Russell T Davies had established Rose's connection to Bad Wolf, which therefore allowed Piper to participate in "The Day of the Doctor" anyway.