In 16087, Styre was ordered by the Grand Strategic Council to make an assessment of human physical limitations. He lured eight human soldiers from GalSec to an abandoned Earth to subject them to experiments. Amongst the things he tested were human reaction to fear, muscular strength, and the human breast cage resistance to pressure, using a gravity bar. Styre also noted that humans were highly dependent on fluids and if they did not drink, they started to lose mental and motor skills in as few as three days. He thought this should be exploited.
While he was conducting his experiments, the Fourth Doctor, Sarah Jane Smith, and Harry Sullivan transmatted down to Earth from the orbiting Space Station Nerva. (TV: The Sontaran Experiment) Upon first encountering Styre, Sarah expressed that he bore a strong resemblance to another Sontaran she had previously encountered, Linx. (TV: The Time Warrior) The Doctor convinced Strye that his experiments had actually been conducted on an inferior sub-class of humans. The Doctor, purporting to represent a true human, then engaged him in combat. At the same time, following the Doctor's instructions, Harry secretly sabotaged Styre's ship. Exhausted from his battle, Styre connected his probic vent to his ship to recharge himself. Harry's sabotage reversed the process, so rather than absorbing energy from the ship, the ship drained Styre's energy, killing him. (TV: The Sontaran Experiment)