Catherine Tregenna

Catherine Treganna is a Welsh television writer who has contributed to several Welsh- and English-language television programs. Though she sometimes partners with her brother, Jon Treganna, she has been credited solely for her work on Torchwood.

Her scripts for the Doctor Who spin-off have all featured significant advancements in the emotional lives of the main characters. In particular, she is responsible for giving Owen Harper his first significant on-screen love affair (Out of Time), introducing Jack's brother (Adam) and his namesake (Captain Jack Harkness) and for revealing Torchwood 3 to Rhys Williams (Meat).