Lisa Aziz, former Westcountry Tonight newsreader, is taking broadcaster ITV to an employment tribunal over racial discrimination claims.
The 47-year-old alleges that a colleague mimicked Sir Trevor McDonald's accent, while claims of age and sex discrimination have also been made.
She is suing the company for up to £5 million, having been suspended during the summer after allegations of wrongful expenses claims - although she insists she was "set up" in order to be removed from her position.
Responding to the accusations, ITV - which comprises 15 regional licences across the UK - said that an internal investigation found there had been no wrongdoing.
"Given the allegations which have been levelled at the company and a number of employees, we feel that we are left with little choice but to vehemently deny any discriminatory behaviour," it added.
Ms Aziz was the first Asian presenter of a national terrestrial news programme in the UK.