Answer
The actor playing the character opposite Caitríona Balfe's lead in the series Outlander is Sam Heughan. Heughan plays Jamie Fraser, a Scottish highlander who is the love interest of Balfe's character, Claire Randall. The two characters meet in 1743 when Claire travels back in time from 1945. Heughan and Balfe have excellent chemistry on-screen, and their relationship is one of the most popular aspects of the series.