Picked this up off of Sci Fi Wire:
Anthony Stewart Head, best known as Giles in TV’s Buffy the Vampire Slayer, will guest-star in the upcoming second season of the BBC’s hit SF show Doctor Who, the BBC Web site reported. Head will appear in an episode in which the Doctor (David Tennant) battles the evil Krillitanes, the site reported.
The episode will also mark the return of Elisabeth Sladen, who’ll be making her first TV appearance as Sarah Jane Smith since 1983.
And the Doctor will also be reunited with his faithful robot dog, K9, last seen as the companion to Tom Baker’s Doctor between 1977 to 1981.
“I am delighted to have been invited back on board the series, and a little gathered rust is no object to a fully functional K9,” John Leeson, the original voice of the robot dog, told the BBC Web site.
The episode will be seen in the United Kingdom next spring. In it, the Doctor and his team investigate sinister events at a modern-day comprehensive school.
I’m looking forward to the next season as it is already, but now I’m curious to see how the handle bringing in a couple of old companions from the original series.
Update: I didn’t notice it at the time, but it turns out that Dave M. submitted an entry about this prior to me writing mine so Dave should get some credit for this as well.