New Worlds was branding applied to three of Big Finish Productions' prose publications involving Iris Wildthyme or Big Finish-created characters: Wildthyme on Top, The Coming of the Queen and Project: Valhalla, as well as to the Bernice Summerfield audio series between The Tartarus Gate and Dead Man's Switch, and to the Iris Wildthyme audio series between Wildthyme at Large and The Claws of Santa.