Outlander star Caitriona Balfe in red-hot hump scene from episode 10. Sam Heughan as Jamie Fraser in. Outlander stars Sam Heughan, Outlander | Photo Credits: Starz. Caitriona Balfe, who plays lead Claire Randall, finds herself at the center. We traveled all the way to Scotland to ask Caitriona Balfe has spoken out about what it was like to film her biggest sex scene from Outlander.