Leland Orser, Shawnee Smith, Hiro Kanagawa and Bradley Whitford guest star in the first episode of The X-Files up this week. Firewalker was written by Howard Gordon and first aired on 18 November, 1994. Agents Mulder (David Duchovny) and Scully (Gillian Anderson) have their office back! The X-Files are re-opened, and they are off to…