Kowalski is a former football player with the 1984 Miami Dolphins that Roger imports as part of a "dolphin" exhibit at a marine park that he opens with Stan in "The Nova Centauris-Burgh Board Of Tourism Presents: American Dad".
With Hayley working as a trainer, Kowalski leaps through hoops for fish while other players swim by in salute. But when the park falls flat, Roger imports a vicious killer whale to replace the Dolphins, sending them off to a fish market. Hayley steals the truck, takes the players out to the ocean and frees them. As she tearfully encourages Kowalski to leave, he leaps over her head à la Free Willy in celebration.