That costume... it just fits
with the Time Lords. Although I vastly preferred the ones from the War Games.
Multi-parter, natch. Four-five episodes at least. I'd bring back all the Docs, recasting Hartnell, Troughton and Pertwee and stick a wig onto Tom Baker. First episode would be a double-tribute to the Brigadier and Sarah Jane/Nicholas Courtney and Elisabeth Sladen. It would lead into the meat of the story, not sure how. I'd bring back Rose-if only to show her compared to those two icons, she was kinda small potatoes.
I mean, come on. Sarah Jane was the Doc's best friend! He even said so! She'd whine about not being the center of attention, and comparing her to Sarah Jane... cathartic, eh?
As for other companions...
Susan Foreman, Ace, Leela, Ian and Barbara, Sergeant Benton, K9-good call there, Mikey. Not sure who else. Maybe Peri, but I don't remember much about her.
Oh, Jamie! Gotta have Jamie!
As for enemies... the Master? Davros and the Rani. Hell, throw in the Meddling Monk and the War Chief for the hell of it. Daleks, Cybermen, Zygons, ice Warriors, Weeping Angels... the whole lot of them!
And Colonel Mace, and...
*Sees Mikey, Seafort, Ian, Graham and everyone else staring at him-or more glaring
I'll be quiet.