Bryant voiced the character of Peri in several audio plays produced by Big Finish Productions, alongside both Peter Davison as the Fifth Doctor and Colin Baker as the Sixth Doctor. In several of these stories, the Fifth Doctor and Peri are joined by another companion, the Egyptian princess Erimem. The Sixth Doctor audio play "The Reaping" introduces Peri's mother, Janine Foster, played by American actress Claudia Christian (although in reality, Christian is five years younger than Nicola Bryant). The play, set in 1984 as the Doctor takes Peri back to her time to attend the funeral of the father of a friend of hers, confirms Peri's late father's name as Paul and mentions that Howard and Janine Foster have gone their separate ways, but does not mention Peri's step-siblings. After The Doctor and Peri thwart a Cyberman attempt to set up a conversion factory in Baltimore, Peri plans to stay with her family, but Janine is subsequently killed due to an accident involving remaining Cyber-technology, cutting Peri's last familial tie to Earth and prompting her to return to her travels with The Doctor when he comes to visit her at her mother's grave.