10 Biggest Doctor Who Missed Opportunities

10. River Not Meeting Captain Jack

Let's start off with a fun one: how did River Song never cross paths with Captain Jack Harkness?

It's obvious from their cheeky personalities and disregard for rules that they'd make a brilliant pair for a standalone adventure, but that opportunity is pretty much deader than Gallifrey at this point.

It wasn't for a lack of trying though. Efforts were made to bring Jack into the Doctor's team in A Good Man Goes To War, and you can only imagine the fireworks that would've ensued if Barrowman and Kingston had got into a quippy back-and-forth.

Or how about River in Torchwood? She would've fit perfectly with the more adult tone of that show, and the fact that this was never considered as an option (or maybe it was, who knows) is disappointing.

The similarities between the characters - right down to both owning a vortex manipulator and the same squareness gun - certainly suggest that they have met, and meet they did... in a Big Finish audio drama.

It's better than nothing, but one of the most-requested team-ups in Doctor Who history deserved an onscreen adventure.