Rev and Roll Episode 4 Winter Bestival/The Mystery of the Missing Tree Episode Title: Winter Bestival/The Mystery of the Missing Tree Episode Description: After a big snowstorm, Rev and Avery compete for title of Champion of the Winter Bestival. Rev's goal is to finally beat Avery, who usually "bests" him-while Avery is determined to maintain her crown as Princess from last year's Bestival. Rev's Dad suggests trying a "slow and steady" approach to win, but Rev can't resist his usual approach-a whole lot of "Rumble power!"