The fourth season of Ang Probinsyano deals with the looming mid-year elections in the Philippines, where Senator Mateo F. De Silva and Director Renato Hipolito are both jockeying for the top spot at the polls in order to secure the Senate Presidency and parlay such victory into a career as the President of the Philippines. Both De Silva and Hipolito relentlessly hunt down Cardo and the remnants of Pulang Araw in order to appeal to the voters. De Silva funds his campaign with the aid of his new-found ally, Don Emilio Syquia, through their drug-trading business. With the remaining members of Pulang Araw and his allies in prison, Cardo forms the vigilante and revolutionary far left group Vendetta to combat corruption,injustice,oppression,and despotism in the Philippines. However, with the elections drawing nearer, both De Silva and Hipolito continue to malign the name of Vendetta through Luis "Buwaya" Mangubat and Homer "Alakdan" Adlawan's Kamandag, respectively, each performing acts of terrorism which are blamed on Vendetta. Elsewhere, Cardo's marriage to Alyana is also put to the test as she is pursued by her new boss, Marco Cabrera. 1 episode per day GMT18:30
