The Gangstah

While there may be resemblance between the Mastah and the Gangstah, Theo Lowe has confirmed that, unless explicitly shown, two characters in Doctah Who, no matter if they are being played by the same actor, are not the same character. The Gangstah is a Time Lord encountered by The Doctah in Season 2 Episode 1, The Doctah's New Look. He is met in a new, unnamed location that hasn't been seen before on Doctah Who. He is made an enemy when the Doctah steals his Coat.

Description
The Gangstah has a high interest in the 1920s on Earth, particularly in the mafia. He emulates a member of the mafia, wearing a hat and wielding a revolver and Thompson submachine gun that both apparently fire rounds silently. Prior to the Doctah stealing it, he also wore the Coat.