Disney's Adventures of the Gummi Bears (1985)

S2E4 Over The River And Through The Trolls

Title: Across the River and Through the Trolls Plot: A group of trolls schemes to seize a gold delivery guarded by Sir Gawain. Desperate for assistance, Cavin calls upon the Gummi Bears for help, revealing that Sir Gawain is not only his grandfather but also the one who unearthed Zummi's precious medallion.