Because I haven't written the 50th yet I will instead be doing some mini-books for it starting on the 12th of November 11 books, 11 doctors, 11 days, so I will update a new book each day so here are the first 5 book titles the last 6 will be revealed after the 4th doctor book has been released.
1- Children of Tartarus
The First Doctor and Susan fight for survival at the foot of Tartarus as the great titan awakes and plans to destroy all of mankind.
2- Creatures of Pity
At the Peace Conference between the Humans and the Gardoons, the Second Doctor and his friends find a human captive, held by the seemingly peaceful Gardoons.
3- Eye of Destiny
The Third Doctor and Jo Grant are called in by U.N.I.T to investigate a new kind of phenomenom, a gigantic eye in space, allowed by the Timelords to move in the TARDIS, the Doctor travels to a rock nearby to investigate further but discovers something sinister at it's heart.
4- Skull of the Sun
The Fourth Doctor and Sarah Jane Smith land on the planet Tresdane in the 48th Century where the people of the city Ferteen worship the god Gewdee, but as the Doctor looks further into their culture he finds a horrible secret about Gewdee and his origin.
5- Terror of Greece
The Fifth Doctor and his friends land in the year 71 A.D. where a sinister being lurks at the bottom of the well of the town of Athens, as the distant gods of Greek Mythology reawaken the Doctor fights to keep secrets from his past from being revealed and he must fight for the world as well as himself.
6,7,8,9,10 and 11's will be out on the 15th of November so look out for them \:-)X