Well, now that the Sarah Jane Chronicles are over, we could use a kid-friendly Doctor Who Spin off. Imagine:
The Bessie Files
Bessie is given an AI program of some kind and has kids run around solving mysteries with her. But get this: All of the mysteries involve aleins! And maybe Bessie can go through time or something. Also, Bessie gets a regeneration sequence in the first episode after being shot down by aleins of some sort.