Katherine Elizabeth “Katie” McGrath (born 24^th October 1983) is an Irish actress who is best known for portraying the Lady Morgana Pendragon on the BBC One show Merlin from 2008 to 2012. Katie is currently the star of horror television series Slasher as shown on Chiller.

Katie was raised in Ashford, County Wicklow, Ireland. She studied the International Baccalaureate at St. Andrews College before graduating from Trinity College, Dublin with a degree in history.  She wanted to work in fashion journalism and took a job at Image magazine, before becoming a wardrobe assistant on the set of The Tudors. While working on The Tudors, McGrath was advised to try acting, so she sent photographs around to Irish agents.

“Being an actress was kind of like when you’re a kid, and you want to run away and join the circus, it’s something you really want to do, but then you grew up and got a proper job. It was a dream, but I didn’t think it would ever be reality, and yet here I am” ~ Katie McGrath.

Katie was cast in Damage, an Irish TV-movie in 2007. She also starred in Bedrock Production’s play La Marea at the Dublin Theatre Festival 2007. She appeared in the feature films Eden and Freakdog in 2008, before being cast in Merlin.

In 2009, Katie starred in a five-part docudrama for Channel 4 exploring the life of Queen Elizabeth II, The Queen, in which she played a young Princess Margaret, Emilia Fox portrayed Elizabeth II in the same episode Katie McGrath acted in, the two had previously worked together as sisters Morgause and Morgana in Merlin.
In 2010, Katie was cast in Madonna’s directorial debut W.E., an Edward VIII biopic. Katie played Lady Furness, the king’s former mistress who introduces him to Wallis Simpson.

In February 2011, Katie began filming the comedy-drama film A Princess for Christmas in Romania. The film premiered in December 2011. In September 2011, Katie voice-acted the lead character in the Irish animated short film Tríd an Stoirm (Through the Storm). Later that month, Katie was cast as Oriane Congost in Labyrinth.

In February 2013, Katie was reunited with her The Tudors co-star and close friend Jonathan Rhys Meyers (Katie worked in the wardrobe department and portrayed a small role on The Tudors) in NBC and Sky Living’s horror drama TV series Dracula, which started airing in autumn 2013. Katie portrays Lucy Westenra.

In June 2013, McGrath co-starred in episode four of the Channel 4 show Dates alongside Gemma Chan as a young lesbian on the dating scene.

In 2015, Katie had a supporting role as Zara in the film Jurassic World. Earlier that year, she starred in the Crackle original spy-thriller, The Throwaways.

n November 2014, Katie co-starred in a Hozier music video for the song From Eden with the singer.
She will co-star in Guy Ritchie’s Knights of the Roundtable: King Arthur which will be released in 2017.

Katie is the lead actress in Chiller’s original series Slasher which premiered on March 4, 2016. In December 2016 her movie “Buttons” in which she plays one of the main characters will premiere on PBS.

source both IMdB and wikipedia