The show shifted its broadcast channel each series to reflect its growing audience, moving from BBC Three to BBC Two to BBC One, and acquiring US financing in its fourth series when it became a co-production of BBC One and Starz. In contrast to Doctor Who, whose target audience includes both adults and children, Torchwood is aimed at an older audience.
The show's broadcast channel changed with each season to reflect its expanding viewership, moving from BBC Three to BBC Two to BBC One, and securing US funding in its fourth season when it became a joint production of BBC One and Starz. Unlike Doctor Who, which targets both adults and children, Torchwood is aimed at an older audience.