Tonton Streaming Disney's Adventures of the Gummi Bears (1985) S1E8 - When You Wish Upon a Stone

Cavin is having problems with knight training. Cubbi suggests an underground wishing stone could be a big help, but they soon learn the stone is guarded by a mean giant. Cavin and Cubbi must find several different ways to thwart to giant, until Cavin finally realizes being a knight is not always about strength.