You can see it on YouTube here
. It's a bunch of short clips from various SJA episodes and Sarah Jane's appearances on new Who
, with a voiceover by Sarah Jane drawn from used and unused takes of the ending speech of "The Lost Boy" from series one: "I've seen amazing things out there in space, but strange things can happen wherever you are. I have learned that life on Earth can be an adventure too. In all the universe, I never expected to find a family." Then there's a last shot of the Earth and a title card reading "And the story goes on... forever."