Scrug is first seen in The Legend Thief, where he is alongside Scorm and Scutter while trying to build a statue of the "Great Scorpion in the Sky". He often says stupid stuff which makes Scorm slap him with his tail numerous times.
He is seen later in the following three episodes working and battling in the Scorpion Caves.
Scrug greatly resembles Scolder and is basically a generic Scorpion soldier. He sometimes carries a crude axe-like weapon.