List of Kuruluş: Osman episodes

10 or 15 years[lower-alpha 1] after the Berke-Hulagu war, Ertuğrul Gazi goes to Konya and he leaves his brother, Dündar Bey, in charge of his tribe. Dündar Bey is easily swain by others into doing their misdeeds, he falls into the trap of the devious Selçuk Sançak Bey, Alişar, and the merciless princess of Kulucahisar, Sofia, who seeks to kill all the Turks. Osman, Dündar's nephew, can see through Alişar and Sofia's plans and warns him about them, despite his refusal to listen. As they continue to build more tension against the Kayı, Geyhatu sends Komutan Balgay to cause more trouble and stop the Kayı, especially Osman, from rebelling against the Mongols. Dündar, who bows down to the Mongols becoming the Sançak Bey, can't see Alişar's anger over his position being given over to him and he believes him when Alişar blames Osman for his son's killing. Soon after, along with the threat from Kulucahisar, Dündar is shown the truth, Alişar is beheaded by Osman, and Osman has married his love, Bala. Following this, after many difficulties, Balgay is killed while Kulucahisar is conquered by the Kayı with Sofia's death happening in the process.

Aya Nikola is sent to become the new Tekfur of İnegöl followed by Ertuğrul's return in the tribe. Meanwhile, Yavlak Arslan, the new Uç Bey, seeks to create his own state and sees Osman as an obstacle, later on they unite against the new threat created by the new Han of the İlhanlı (transl. Ilkhanate), who allies with Nikola against the Turks of Anatolia. Bala also faces the arrival of Targun, Nikola's spy who allies with Osman to save her father, İnal Bey. Along with these problems, Osman is elected as the new Bey after his father's death, whilst he decides to marry a second wife according to his father’s will.