Freema Agyeman (born Frema Agyeman) is an English actress who is known for playing Martha Jones in the BBC science fiction series Doctor Who (2007–2010), Alesha Phillips in crime procedural drama Law & Order: UK (2009–2011), Amanita Caplan in the Netflix science fiction drama Sense8 (2015–2018), and Dr. Helen Sharpe in the NBC medical procedural series New Amsterdam (2018–present). Following her departure from Doctor Who, Agyeman reprised her role of Martha Jones in Doctor Who spin-off series Torchwood and had a role in the BBC series Little Dorrit. In 2013, she made her US television debut on The CW's teen drama The Carrie Diaries as Larissa Loughlin, a style editor at Interview magazine. Other television appearances include Old Jack's Boat, Silent Witness, and Survivors. Agyeman also appeared as Penny in the 2015 film North v South.