They have a light blue metallic surface with red parts that mainly make up their joints. They have a square head with two glowing eyes and a mouth. Their bodies have a storage cavity, along with two claw-like arms and two box-shaped feet. On some occasions, the robots have wheels.
Role in series
"House Sittin' for Sandy"
When Sandy goes to a science convention, she leaves SpongeBob in charge of her treedome and tells him to count each robot to clarify that none of them are missing. Eventually, the robots go on a rampage and destroy Sandy's treedome.