The Fonz and the Happy Days Gang (1980)

S3E8 The King of Assassins

Gabrielle, Autolycus, and Joxer team up to thwart Jett, Joxer's twin brother and a dangerous assassin, who is set on eliminating his next victim—Queen Cleopatra. With time running out, the trio must devise a plan to stop Jett before he can carry out his deadly mission.