Episode 91 can be found here.
After learning that New Yugoha is working on a secret project in Egypt, Yuni, Brutus, and Tori head to the land of the pyramids. Once there, they encounter Zenith. When Zenith challenges Yuni to a New Yugohan style duel, he has to team up with Yugi for the first time.
Until next time, duel on!