The first series of Doctor Who spin-off Sarah Jane Adventures, featuring investigative journalist and old-time companion Sarah-Jane Smith (played by the late Elisabeth Sladen), began on 24th September 2007, following a one-off special on New Year's Day of that year.
The show ran for five series, during which Sarah Jane and her gang battled aliens and saved the world. As well as a group of teenagers, Alexander Armstrong was on hand as the voice of alien supercomputer Mr Smith.
CBBC will be marking the show's anniversary by showing three episodes from the first series on Sunday. 24th September from 2.10pm. Please don't dismiss SJA as a kids' show if you haven't seen it before: it's genuinely exciting.