The Doctor and Romana are enjoying a holiday in Paris, 1979, when they become aware of a fracture in time. During a visit to the Louvre to see da Vinci's Mona Lisa, the Doctor purloins from a stranger, Countess Scarlioni, a bracelet that is actually an alien scanner device. 　　He, Romana and a private detective named Duggan are then 'invited' to the chateau home of Count Scarlioni, where they find hidden in the cellar six additional Mona Lisas - all of them originals! The Count is revealed as an alien called Scaroth, last of the Jagaroth race. He was splintered in time when his ship exploded above primeval Earth, and in his twelve different aspects has since been guiding mankind's development to a point where time travel is possible. 　　His intention is to go back and prevent the destruction of his ship. To finance the final stages of this project, overseen by the misguided scientist Kerensky, he plans to steal the Mona Lisa from the Louvre and then secretly sell the multiple copies that one of his earlier splinters has forced da Vinci to paint. 　　The Doctor realises that the Count must be prevented from carrying out his plan as the explosion of the Jagaroth ship provided the energy that initiated life on Earth. Following Scaroth's trail in the TARDIS, he travels back to primeval Earth. Duggan fells Scaroth with a punch, thereby ensuring that history stays on its proper course.

The Doctor and Romana are enjoying a holiday in Paris, 1979, when they become aware of a fracture in time. During a visit to the Louvre to see da Vinci's Mona Lisa, the Doctor purloins from a stranger, Countess Scarlioni, a bracelet that is actually an alien scanner device. 　　He, Romana and a private detective named Duggan are then 'invited' to the chateau home of Count Scarlioni, where they find hidden in the cellar six additional Mona Lisas - all of them originals! The Count is revealed as an alien called Scaroth, last of the Jagaroth race. He was splintered in time when his ship exploded above primeval Earth, and in his twelve different aspects has since been guiding mankind's development to a point where time travel is possible. 　　His intention is to go back and prevent the destruction of his ship. To finance the final stages of this project, overseen by the misguided scientist Kerensky, he plans to steal the Mona Lisa from the Louvre and then secretly sell the multiple copies that one of his earlier splinters has forced da Vinci to paint. 　　The Doctor realises that the Count must be prevented from carrying out his plan as the explosion of the Jagaroth ship provided the energy that initiated life on Earth. Following Scaroth's trail in the TARDIS, he travels back to primeval Earth. Duggan fells Scaroth with a punch, thereby ensuring that history stays on its proper course.

该剧讲述了名为“Doctor”的神秘外星时间旅行者，随着他的时空机器TARDIS的冒险故事，他的时空机器外观看上去像1950年代的警亭。博士带着他的伙伴罗斯在时间、空间中探索悠游、打击邪恶力量、拯救文明、帮助人民、纠正错误、解决各类问题。

该剧讲述了名为“Doctor”的神秘外星时间旅行者，随着他的时空机器TARDIS的冒险故事，他的时空机器外观看上去像1950年代的警亭。博士带着他的伙伴罗斯在时间、空间中探索悠游、打击邪恶力量、拯救文明、帮助人民、纠正错误、解决各类问题。

第15任博士（舒提·盖特瓦 Ncuti Gatwa 饰）华丽登场，和拍档Ruby Sunday（米莉·吉布森 Millie Gibson 饰）用TARDIS穿梭不同时空，从英国摄政时代去到未来世界，遇上各种新朋友与新敌人，更要面对史上最强大的敌人。。

博士的塔迪斯被追尾，肇事船居然是泰坦尼克号。原来一家外星旅游公司仿照泰坦尼克号制造了一艘巨大的泰坦尼克号宇宙飞船。但是飞船却连续遭遇不幸：防护罩被毁，装上陨石群，船长死去，服务机器人嗜杀成性……。

博士的塔迪斯被追尾，肇事船居然是泰坦尼克号。原来一家外星旅游公司仿照泰坦尼克号制造了一艘巨大的泰坦尼克号宇宙飞船。但是飞船却连续遭遇不幸：防护罩被毁，装上陨石群，船长死去，服务机器人嗜杀成性…

第九季的前导集，多动症的博士怎么可能耐得住寂寞而进行冥想？冥想又是为了什么？