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Sebastian Cobb is a scientist whom Lyle Lanley hired to build the North Haverbrook monorail.

Over Cobb's protests, Lanley used shoddy materials throughout the monorail construction process in North Haverbrook, which left it with extensive faults in the brakes and wiring. Unsurprisingly, the monorail crashed on its maiden run, injuring many people and destroying North Haverbrook's economy.

Marge Simpson met Cobb just before the opening of the Springfield Monorail. Suspicious of Lanley, she drove to North Haverbrook to investigate his claim that he had built a monorail there. On arriving, she found the ruins of the North Haverbrook monorail and residents unwilling to talk about the monorail or even admit to its existence. Cobb, however, was willing to talk and filled Marge in on the history of the North Haverbrook monorail. When he heard that the Springfield monorail was about to open, he said, "You just better have a damn good conductor," and the two of them quickly returned to Springfield to try to stop the monorail's grand opening...