Ep 25. Mt. Zuzu

When Zuzu learns that mountains are named after the person who discovers them, the gang heads off in the hot air balloon to find an unnamed mountain on which to plant a flag; they encounter Gilda and later, Craggy McMatterhorn, who deflates their balloon in a rush to get to the unnamed mountain first. But the gang prevails and Zuzu plants the flag, naming the mountain after all of them.