Resident weakling Tenteng (Dolphy) finds himself on the verge of committing suicide as he feels the brunt of his brothers' abuse, the jeers of the townspeople, and the rejection of his beloved Lota (Lotis Key) coming upon him in droves. But just when he is about to give up, he is entrusted with a magical barbell that enables him to transform into the invincible Captain Barbell, the defender of the town against all its wicked elements. As he rids the town of monsters and lawless groups, Tenteng finds it increasingly difficult to woo Lota, who grows more smitten by his alter ego. Will Tenteng resist giving in to the temptation of revealing his true identity just to win Lota's love?