Fortunately, I am one, but for anyone else, this program is horrid. The story is so contrived and confused, it's impossible to follow. Hence, Don't try. This was written for one of those charity fundraising specials, and is just a showcase to see all of the living Dr. Who stories one more time. The big plusses are:
1) final Jon Pertwee performance as the Dr.
2) First time Tom Baker agreed to reprise his role since he left after his 7 year stint (sorry, his 5 Doctor's appearance doesn't count - that was filmed during his stint as the Dr for the "lost" episode Shada).
As a reunion, it's nice. I don't think anyone else will get it.
1) final Jon Pertwee performance as the Dr.
2) First time Tom Baker agreed to reprise his role since he left after his 7 year stint (sorry, his 5 Doctor's appearance doesn't count - that was filmed during his stint as the Dr for the "lost" episode Shada).
As a reunion, it's nice. I don't think anyone else will get it.