Originally Posted by Lord Smexy:
“The Three Doctors is fantastic. Troughton's silliness is a bit over-exaggerated, but it was a lot of fun seeing Pertwee's arrogant, showy-off, classy persona getting impatient with Troughton's friendlier and more Alice in Wonderland-esque character. My two very favourite Doctors behind only Tom Baker, plus The Brigadier, Jo and Benton and a new villain in the form of Omega.
It was a shame Hartnell couldn't do much but he did make up for it by getting some of the best lines.”
Yes. I love this one too. Hartnell does get all the best lines - usually at the expense of his "replacements".
Sorry, can't resist quoting this

:
DOCTOR 1: [on scanner] Ah, there you are. I seem to be stuck up here. Hmm? Hmm? Oh, so you're my replacements. Huh. A dandy and a clown. Have you done anything?
DOCTOR 2: Well, we've, er, assessed the situation.
DOCTOR 1 [on scanner]: Just as I thought. Nothing.
DOCTOR: Well it's not easy, you know.
DOCTOR 2: It's not as if we know what that stuff is.
DOCTOR: No.
DOCTOR 1 [on scanner]: Then I'll tell you. It's a time bridge.
DOCTOR 2: It's a what?
DOCTOR: I see.
DOCTOR 1 [on scanner]: Now, what's a bridge for, eh?
DOCTOR 2: Well, er
DOCTOR: Crossing?
DOCTOR 1 [on scanner]: Right. So stop dilly-dallying and cross it!
(The image fades.)
DOCTOR 2: No! No wait!
DOCTOR: You faded him again.
DOCTOR 2: I did not fade him. You saw
DOCTOR: Yes, you certainly did.
JO: I hate to ask, but who was that?
DOCTORS: Me. Me!