Doctor Who: The Time of the Companions: Book 3 (Doctor Who: The Companions' Adventure) Page 31
by Cour M.
[11] Since everything with Ten takes place in series 4, right before Partners in Crime, the last time he saw Martha before this was in Last of the Timelords.
[12] There is an Author’s Note and Afterword behind this page to explain some things in the trilogy and questions that you may have.
[13] Metebelis 3 is an all blue planet practically. The Doctor went there in his third regeneration, and he got a blue crystal there that had the power to disillusion someone who had been hypnotized.
[14] Yes, I admit that I took the names of the first three historic characters that appeared in the first pseudo-historic episodes of New Who. This may be cheesy, but I can’t help but like it.