The Early Adventures continued telling stories from the first two Doctors that The Companion Chronicles began, although producer David Richardson described the series as having a format closer to that of The Lost Stories "except here we have pushed the format to make these productions sound as much as possible like full cast drama".
The stories were performed with two of the original cast along with a cast sized similarly to the Doctor Who monthly range. The two original cast members performed and narrated characters such as the Doctor and other companions.
Series three saw the return of the First Doctor. For the first two stories, the role of Barbara Wright was recast, as Jacqueline Hill was deceased. She was now voiced by Jemma Powell, who had previously played Hill in An Adventure in Space and Time. Additionally, the first story featured Ian and Susan, while the second featured Ian and Vicki. Like the first series, the third story featured Vicki and Steven, while the fourth featured Steven and Sara.