This was the first episode of the series to air after the death of Patrick Troughton
on March 28, 1987. Troughton played the Second Doctor from 1966 to 1969.
This episodes marks the first appearance of Sylvester McCoy (The Seventh Doctor) on the series.
In the regeneration scene, the Sixth Doctor is played by Sylvester McCoy as Colin Baker declined to reprise his role. Along with Richard E. Grant, McCoy is one of only two actors to play two different incarnations of the Doctor.
The Seventh Doctor: (his first words) That was a nice nap, now down to business!
The Doctor: Perhaps this is my new persona - sulky, bad-tempered.
The Doctor: I'm as fit as a trombone.
The Doctor: A bad workman always blames his fools.
The Doctor: Like a bull in a barber shop.
The Doctor: You don't understand regeneration, Mel. It's a lottery and I've drawn the short plank.
The Doctor: The more I know me, the less I like me.
The Doctor: Thank goodness in this regeneration I've regained my impeccable sense of haute couture.
The Doctor: Absence makes the nose grow longer.
The Doctor: More hasta, less vista.
The Doctor: The proof of the pumpkin is in the squeezing.
The Doctor: And I'm suffering from post-regeneration amnesia, as far as I can remember.
The Doctor: Time and Tide melts the snowman.
Rani: Leave the girl, it's the man I want!