Career
She is known for playing Petronella Osgood, a supporting character in the British Broadcasting Corporation television series Doctor Who. In September 2005, Watson and Oliver performed their first show together at the Canal Cafe Theatre in London. Since then they have taken sell-out shows to Edinburgh Festival Fringe, in both 2006 and 2007.
Oliver has performed in various radio and television productions, including Doc Martin starring Martin Clunes, the Penny Dreadfuls" radio series The Penny Dreadfuls Present.
The Brothers Faversham and in the radio series Another Case of Milton Jones. She played the part of Natalie in Peep Show on Channel 4.
She appears in the film Angus, Thongs and Perfect Snogging as Mission Stamp and in early 2009 could be seen in Channel 4"s sitcom Plus One. In 2010 she played Mimi Throckmorton in Material Girl on BBC1, alongside Lenora Crichlow and Dervla Kirwan.
In 2013 she appeared in the first episode of "The Great Comic Relief Bake Office" and was named as "Star Baker".
In November 2013, she appeared in the 50th anniversary special of Doctor Who, "The Day of the Doctor", as Osgood. She was seen wearing the Fourth Doctor"s iconic scarf. In November 2014 she appeared again as Osgood in the series finale of Peter Capaldi"s first series, dressed as the Doctor, this time mimicking Matt Smith"s 11th Doctor (shirt and red bow tie) as well as David Tennant"s 10th Doctor (blue trousers and red Converse shoes) as they faced the Cybermen, where she is seemingly vaporized by Missy.
On 8 May 2015, it was announced that Oliver would be returning as Osgood in a two-part story broadcast in the autumn, featuring the Zygons.
Oliver returned to the role of Osgood in the Doctor Who two - part story The Zygon Invasion and The Zygon Inversion where her perceived demise was explained.