SO THIS GUY WE ALL FORGOT ABOUT FROM DAY OF THE DOCTOR :
If he joined the TARDIS team up of Clara and Twelve, than-
The Actor playing the doctor will be 55 years old
The Doctor will be traveling with two school teachers from coal hill school
The female companion would be a history teacher
The male companion would be a science teacher
And finally, if Jenny returned, who Moffat requested to keep alive to “save for later” The Doctor would be traveling with a family member.