Janet was one of the many Weevils either disgorged by the Cardiff Rift or born in the city. She lurked around the Royal Infirmary and killed a hospital porter before she was captured by Torchwood, and held in a cell. Jack Harkness later showed it to Gwen Cooper when explaining how Weevils were alien. (TV: Everything Changes)
When a Weevil was killed by a person infected with an alien tapeworm, Janet started whistling to mourn. Later, when Marianne Till, another victim of a tapeworm, was brought to the Torchwood cells, Janet was frightened of her and kept away from her cell. (PROSE: Slow Decay)
When Torchwood was trying to find the Weevil Fight Club, they let Janet loose and used her telepathic senses to find others of her kind. She was abducted by the Fight Club, during which she was brutally beaten and electrocuted with shock prods, and used as a wrestler. She faced Owen Harper and nearly mauled him to death before she was captured by and returned to Torchwood. (TV: Combat)
When the cells went offline, Janet escaped, but was trapped in the hold along with Rhys Williams, who was being kept safe by Gwen. Janet did not kill Rhys, but Bilis Manger did, frightening Janet. (TV: End of Days)
When Weevils began to worship Owen Harper because he was a key for Durac to enter this world, he tested this by sticking his finger into Janet's pen; she didn't bite it off. (TV: Dead Man Walking) Even after Durac died, Janet was still distressed around Owen. When thinking about his death, Owen stood by Janet's pen, watching her cower away. (TV: A Day in the Death)
Behind the scenes
- Her name as Janet was revealed in Combat, but the rest of the team were oblivious to Jack's naming of her. He later used the name "Janet" to introduce the hidden Sleeper to her. Janet was still credited as "Weevil", even after her name's revelation.
- Beyond the name, there is little to indicate whether Janet was, in fact, a female Weevil, and the character was played by a male actor.