Matthew Waterhouse played companion Adric, a companion of Tom Baker and Peter Davison's Doctors from 1980 to 1982, in Doctor Who from Full Circle to Earthshock, with cameo appearances in Time-Flight and The Caves of Androzani. After leaving the series, he began a stage career. Waterhouse began his career as a clerk in the BBC news department before securing a role in the television drama To Serve Them All My Days in 1980. Shortly afterward he auditioned for and won the role of Adric. He was a confirmed Doctor Who fan and had had at least one letter printed in Doctor Who Weekly before he took up the role. Between 1998 and 2016 Waterhouse lived in Connecticut in the United States, though he regularly visited the UK. He has since returned to live full-time in the UK alongside his American husband, Tim. In 2010, Waterhouse joined a growing number of Doctor Who actors in publishing an autobiography. In his book, Blue Box Boy, he writes candidly about his experiences making Doctor Who. Waterhouse also appeared in the 2019 documentary A Weekend with Waterhouse that appeared on the Doctor Who: Season 18 Blu-Ray release. Since 2014, Waterhouse has been reprising his role as Adric in Doctor Who audio dramas produced by Big Finish Productions. He has also written two novels for the company's range of Audio Novels based on the series, the most recent being Prisoners of London, released in July 2023.