Polegar operates as a secret agent for T.H.U.M.B., the Tiny Human Underground Military Bureau. His permanent miniature stature, roughly three inches tall, resulted from an accidental encounter with a shrinking laser ray gun. This incident defines his physical scale within the series.

He conducts field missions alongside his partner, Swinging Jack. Together, they deploy specialized miniature vehicles and equipment supplied by T.H.U.M.B. Chief Homer J. Chief commands their operations, issuing assignments from the organization's headquarters.

Polegar's primary objective is countering M.A.D., an antagonistic group whose acronym stands for Maladjusted, Antisocial, and Darn mean. Composed of scientists identifiable by black hats and cloaks, M.A.D. perpetually devises schemes for global destruction. Polegar's interventions specifically target these threats across various missions.