jBot was humanoid and bipedal. He had a grey and white chassis and a translucent red dome on his head.
jBot was an attentive servant of Dr. Venture and his sons after they moved into VenTech Tower. This caused resentment in H.E.L.P.eR., who felt like his position was being usurped.
When the Crusader Action League descended on VenTech Tower (due to a misunderstanding), jBot warned Dr. Venture of the danger. jBot then proceeded to confront the intruders, displaying his offensive capabilities. jBot was subdued by Stars and Garters, who pinned jBot under his shield.
When the fracas was over, H.E.L.P.eR. took advantage of the confusion to push jBot over the side of the balcony. jBot presumably fell a great distance and was damaged beyond repair. His absence was noted by Dr. Venture, though H.E.L.P.eR. feigned ignorance about jBot's fate.