Lukas (Regenerators' timeline)

Commander Lukas was a Gallifreyan aide and bodyguard to President Romana. (AUDIO: Intervention Earth)

Alternate timeline
A version of Lukas was also encountered on a different Gallifrey from an alternate timeline visited by Romana II, Leela and Narvin before any of them met the Lukas from their own timeline.

He was a Chancellery Guard assigned by Slyne to protect Romana from assassination attempts. (AUDIO: Emancipation) He later took Jonias to see Romana II and Narvin. Lukas suggested that Hector's group were terrorists and wanted to send a squad over to them to stop them from leaving. (AUDIO: Evolution) He helped the Chancellery Guard to reclaim Lord Zakar from the freed slaves who had captured him in order to place him on trial for murder. He tried to stop Science Minister Kavil from entering the Panopticon on urgent business. (AUDIO: Arbitration) When the Daleks invaded Gallifrey, he was ordered to protect Romana and remove her from the Panopticon. Assuming that Slyne was dead, he led her to safety away from the Daleks and later took Romana, Leela and Narvin to the armoury to find some weapons that could defeat the Daleks. He was exterminated by the Daleks when they entered the armoury. (AUDIO: Extermination)