'Elementary' Season 4 Spoilers: New Face Brings a New Vibe

The upcoming episode of "Elementary" will bring a new face to the small screen.

It was revealed that fans will get to meet Joan Watson's half-sister in the upcoming episode of the hit CBS series. The most recent episode of the series had Joan realizing that their next client was actually her sibling. With that, there is sure to be some rocky happenings now that the sisters are reunited.

Joan's sister, Lin, will be played by Samantha Quan. Her presence on the series is expected to bring challenges for Joan, who will become frustrated when she find out something about her sister. It was stated that Lin will bring a new element to the upcoming episodes of the series. It will also allow fans to get to know more about Joan.

The executive producer of the series, Rob Doherty, was able to explained their vision for Lin's storyline. As reported by TV Line, he said, "It had never really occurred to me that we had the opportunity to tell this kind of story. I was drawn to Joan's story, this idea that she never really knew her dad and that he was a damaged and troubled guy who fell out of her life a long time ago."

In addition, he was able to compare the differences between the two sisters. Fans can expect Lin to have a different personality compared to Joan. He said,"Unlike Joan, she has some awareness of his other family. And I liked the idea that she resented Joan. If you look at Joan Watson on paper, she is a success. … Specifically how she talks to Joan has a lot to do with assumptions she's made about who Joan is. As far as her living a little more on the edge, I think that just comes from her having a more hardscrabble life."

"Elementary" Season 4 airs on CBS every Sunday.