The First Doctor, Steven, and Dodo

Jackie Lane was the only living companion actor from the classic series who refused the invitation to be part of Big Finish. She quit acting and became a voice-over agent, representing Tom Baker, Nicholas Courtney, and Janet Fielding, among others. However, she retired in 2000, before Big Finish really got started. Although Big Finish could get around her unavailability with Companion Chronicles, they mostly just avoided Dodo for a long time. There were a handful of Companion Chronicles and Short Trips until 2021, when they recast Lauren Cornelius as Dodo. Sadly, Jackie passed away in June 2021, a few months before the first story with Cornelius was released. Since then, Big Finish have released a number of stories with Steven Noonan as the First Doctor and Cornelius as Dodo, filling out what was really a brief period on TV.