Scavenger (The Sontaran Experiment)

Styre's robot was a frog-like robot created by the Sontaran Field Major Styre. While he was on Earth, it aided him in keeping the GalSec astronauts in line. Terullian was used in the drive system of the robot. The Fourth Doctor disabled the robot with his sonic screwdriver. (DW: The Sontaran Experiment)