A poster of Starz TV series "Outlander." Starring Caitriona Balfe as Claire and Sam Heughan as Jamie Fraser. Outlander/ Facebook

Sam Heughan (Jamie) and Caitriona Balfe (Claire) have established themselves as powerful performers in the “Outlander” TV series. But once, they had to nervously face the camera for the first time together. Now, a video of the two actors' audition has been released online.

Celebrating Valentine’s Day, ET Online has released a never-before-seen audition tape of Heughan and Balfe. Heughan was the first to be cast in the show, and even though the producers were convinced Balfe would be perfect as Claire, they still wanted to make sure she would have on-screen chemistry with her fellow lead star.

The video shows the actors enacting an emotional scene from the show. They delivered a stunning performance, portraying high-intensity emotions and ending with Claire crying over Jamie’s shoulder. The two asked forgiveness from each other before hugging.

The producers allowed the cameras to continue rolling even after the scene was done. The chemistry between the two was unmistakable. Heughan lightened the mood by cracking a joke, and the two shared a laugh about the goof-ups.

Show creator and executive producer Ronald D. Moore said that the audition was the one that convinced them that Balfe was the right choice for Claire.

Meanwhile, awards keep piling up for the show and the stars. Balfe has won the best lead actress award for her performance as Claire at the Irish Film TV Academy 2018. Co-executive producer Maril Davis congratulated the actress for winning the award.