According to this, my inner fanboy has considerable cause to celebrate:

"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. "