smith played companion lucie miller alongside paul mcgann's eighth doctor in a radio series of "doctor who", produced by big finish and transmitted on bbc 7 from new year's eve 2006; the plays returned in a second series released on cd and scheduled for bbc 7 broadcast. a third series of adventures for lucie and the doctor aired in march 2009, as weekly half-hour downloads followed by a christmas special. lucie miller made her final appearances in the fourth series, ending in 2011. she also narrated two "big finish short trips" stories, "the curse of the fugue" and "flashpoint." smith has reprised her role as lucie miller opposite mcgann's eighth doctor in "", released in july 2019. smith also appeared as ruby ruggles in the 2008 radio serial "the way we live right now", and took over the role of tamsin trelawny in series 2 of "elephants to catch eels" on bbc radio 4