Caitriona Balfe and Sam Heughan in “Outlander” Season 1. ©Starz! Movie Channel / Everett Collection. When asked what else he “stole” from the set, Heughan declined to specify.

“Outlander: Blood of My Blood” will premiere on Starz on August 8 followed by weekly drops on Fridays. The series is a prequel to “Outlander,” which premiered on Starz in 2014 and has run ...