After seeing that photo this morning -- I have a big, silly grin on my face right now...
You see, Peter Davison was my Doctor when I was a nipper, so the upcoming Children In Need sketch, where Davison's Fifth Doctor meets David Tennant's Tenth, will be particularly enjoyable for me -- and other Doctor Who fans of a certain age.
But I still think any multiple Doctor episodes should have been saved for a Christmas special or a two-parter in the actual series, don't you? Oh well. Steven Moffat is writing, so it should be quality and not a cheap gimmick...