The Bergen Castle is where King Gristle Sr. and his son Prince Gristle lived.

When Bergen Town was created, the Bergen castle was built in the center of the city, as a place where the royal family to live and rule the kingdom. When the Trolls escaped and after Chef was banished, King Gristle Sr. and his son returned to the castle, where the king told his son that he will never experience happiness. 20 years later after Chef captures the Snack Pack, she returns to the castle to reveal to Gristle that she found the Trolls and that they can have Trollstice again. During dinner, Poppy and her friends revel that the scullery maid Bridget was is mystery date and the Bergens and Trolls sing and dance out of the castle to the Troll Tree.