He leaves halfway through the sixth season to go back to England, though he comes back periodically, especially for the show's finale and the episodes leading up to it.
Rupert.
Wesley Windham Price replaces Giles as her watcher. Buffy quits the council in the end of season 3, leaving her "watcher-less." In season 5, she demands that Giles be reinstated as her watcher.
Rupert
Rupert
Rupert
Rupert
Rupert!
Buffy Summers
Rupert
Rupert
Yes he played Giles. Buffys Watcher
Giles' nickname during his misspent youth was "Ripper." Ethan Rayne still calls him that.