Jack Vandham or Commander Vandham (Japanese: ヴァンダム, Vandamu; English dub: /ˈdʒæk ˈvæn.dəm/) is a character in Xenoblade Chronicles X. He is the commanding officer of BLADE, and was formerly the chief engineer on the White Whale. After he is introduced, Vandham is the default client for all Story Missions. He is said to be an open-minded individual, yet this is often overshadowed by his arrogant and sarcastic personality.