Dr. Thaddeus Keane leads and coordinates the Eagle Riders team, reporting directly to the Global Security Council on threats posed by the alien android Vorak and their leader, Cybercon. He assures the Council of the team's preparedness and provides them with advanced weaponry for their missions.

His background includes prior work with scientist Dr. Francine Aikens, whose daughter Nancy vanished in a shipwreck. After Cybercon forcibly launches Dr. Aikens into space aboard a rocket, Dr. Keane initiates searches for her. These efforts yield no resolution, and her fate remains unaddressed in later missions.

Dr. Keane maintains operational command during confrontations with major adversaries like Mallanox (the artificially aged and brainwashed Nancy Aikens) and her subsequent transformation, Happy Boy. He also oversees the Eagle Riders' response to other threats, including the hospitalization of colleague Professor Andro after an attack.

His scientific duties involve developing the team's technology, such as the autopilot robot Auto and the advanced spacecraft Ultra Eagle. Narrative inconsistencies surround his history, including unresolved plot threads concerning his continued search for Dr. Aikens and the absence of his character's death, which occurred in the original unadapted finale of the source material.