描述一位骑士在寻宝的过程中，巧遇一条龙救了他的性命。从此两人形影不离，并共同奋战击败了邪恶的巫师，在奋斗历险的过程中，也学习成为了真正的骑士。

The series stars David Tennant as the Doctor. In the Christmas special he is joined by Catherine Tate as Donna Noble. The series also introduces Freema Agyeman as the Doctor's new companion Martha Jones. John Barrowman also reprises his role as Captain Jack Harkness in the final three episodes which serve as the finale. The series is connected by a loose story arc consisting of the recurring phrase "Vote Saxon".

Adventures in time and space with the Tenth Doctor and his companion Donna Noble.

There's a new drink taking the world by storm — Bubbleshock! Everyone's drinking it. When Maria's dragged along to the factory tour by her new friend, Kelsey — a girl with an opinion on everything — she's plunged into the sinister world of Bubbleshock and the mysterious Mrs Wormwood. There's something terrible behind the hype — something Sarah Jane's interested in too...