"They're both wearing wigs."

Film Following on from the Guardians of the Galaxy trailer, here's the reason why Matt Smith as well as Karen Gillan wore a wig in Doctor Who's The Time of the Doctor. He'd been in the US filming Ryan Gosling’s directorial debut which on the basis of this clip looks full on late era Tarkovsky and has Fitz from Agents of SHIELD looking on bewildered as the Eleventh Doctor runs around the Powell Estate asking us to regard his pecks like he's been locked in a basement for three years with only the dvd of Paradise Towers for company.  Look at his muscles indeed.