Sampson was one of two giant frog-like robots (the other being Hercules) created by Dr. Dometone to guard the Oceanic Plug on Third Earth. Sampson is blue in color while Hercules is green. Both the frogs sit atop the Oceanic Plug and guard it against any threat.
One day when Dr. Dometone took Hercules ashore for supplies, Sampson was viciously attacked by Scrape in his Giant Electric Eel. Sampson was put out of action by the eel's high voltage electric shock.