"Mekk-Knight", known as "Jack-Knights" (ジャックナイツ, Jakkunaitsu) in the OCG, is an archetype largely comprised of LIGHT Psychic monsters (with one Cyberse as an exception) debuting in Extreme Force. The archetype is both related to and supported by the "World Legacy" archetype. All of its Main Deck members are Level 6, 7 or 8 monsters, except for the Level 5 "Jack Knight of the Blue Sky".