written by: Dr Chris Barker and Riley Black written by Michael Fry and Bradley Jackson written by Keith R. Potter and Ken Fulk written by Steve Parker and Jen Metcalf written by Craig Gerber and Catherine Hapka written by Chris Hadfield and Kate Fillion written by Beth Landis Hester and Heather Seabrook written by Chris Hernandez. written by Lucy Tapper and Steve Wilson written by Zoë Bather and Joe Sharpe