Phineas and Ferb invent a time-travelling pocket watch and invite ‘Descendants’ star Kylie Cantrall on an adventure through the ages when a wooly mammoth crashes the party.

When Phineas and Ferb welcome Xochitl Gomez to their backyard to test out a new batch of superhero serums, Xochitl finds herself battling ninjas with a rather odd superpower.