Biff and Sully

Biff and Sully are two construction workers who have appeared from Season 5 to the 1990s (and have made a few cameos in the late 2000s.

Biff
One-half of the Muppet construction worker duo, Biff is an "Archie Bunker-style blue-collar loudmouth". He and his partner Sully made for a "classic comedy team". Whenever they encountered a problem, Biff would ask for Sully's opinion but interrupt him before Sully could answer; however it was Sully who inevitably came up with the solution.

Sully
A construction worker and Biff's silent counterpart, he nevertheless served as the real brains of the duo. He is considered one of Hunt's most "understated and complex" characters.