Well, it's a sci-fi about some dude that's like another creature from another planet that are like Time Lords, but in human form.
So he like travels around time fixing random weird shit to change time to make it better.
But he need a companion so he picks up some chick from aprox, our time and present.
And there, is draamaaaa.. if the chick likes the doctor, which usually happens.
This show has been going on since like the 70's or something.
So there have been 11 doctors, because they transform into another person or something.