Option Nationale wanted an injunction forcing CBC's French-language service Radio-Canada as well as Télé-Québec and TVA to include party leader Jean-Martin Aussant in the leaders' debates.
A Quebec Superior Court judge rejected that request in a decision released Friday.
Radio-Canada and Télé-Québec are running a two-hour debate Sunday night between Parti Québécois Leader Pauline Marois, Québéc Solidaire co-spokesperson Françoise David, Liberal Leader Jean Charest and Coalition Avenir Québec Leader François Legault.
CBC will broadcast Sunday's debate with English translation. Watch live on CBC News Network from 8 p.m. to 10 p.m. ET and online at cbc.ca.
Next Monday, Tuesday and Wednesday, TVA is hosting hour-long, one-on-one contests between Marois and Charest, Charest and Legault, and Marois and Legault, respectively.