In 2007, she appeared in the "Doctor Who" episode "Gridlock", guest starring as Cheen. Crichlow then had a role in BBC One's feature-length drama "Kiss of Death" in 2008, starring alongside Danny Dyer. In March 2010, Crichlow returned to the world of "Doctor Who" in the audio release of "The Architects of History", playing a new character, Rachel Cooper, a companion of the Seventh Doctor in an alternate timeline. Crichlow then played the role of Portia in a performance of William Shakespeare's "The Merchant of Venice", for the BBC's educational platform Bitesize.