The biggest mystery
Clara is one of the companions of the famous doctor in the series Doctor Who, the famous English series of science fiction which tells the adventures of the doctor, a lord of the time quasi immortal being able to travel in the time and the space thanks to his vessel: the TARDIS. Clara meets the Eleventh Doctor for the first time when she is a child and then meets him again several years later when she is an adult and he is younger. Clara is a mystery to the Doctor because he has witnessed her death several times but she always seems to return. This fact is explained when the doctor meets The Great Intelligence and learns that Clara has been divided into an infinite number of copies.