Maria and her father must make a big decision while Sarah Jane and the boys investigate an incident at an observatory.
The Doctor gets every ally he can find to stop Davros and the Daleks.
So, the Earth was stolen…
Donna sees how much a single left turn could have changed everything.
The Doctor and River Song continue to evade killer shadows as they work to solve the riddle of the Library.
Killer shadows stalk through a giant library, chasing the Doctor, Donna, and a mysterious woman who seems to know the Doctor very well.
The Doctor and his crew land on a wartorn planet where a cloning machine produces a daughter for the Doctor.
The Doctor races to stop the Sontarans from poisoning the entire Earth and UNIT from starting a galactic war.
Martha, now working for UNIT, gets the Doctor’s help to look into a mysterious car exhaust system that seems to kill people.
The Doctor gains a new companion that he’s met before in the incomparable Donna Noble.