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[[File:XyzOverlayNetwork.png|thumb|210px|A regular Overlay Network.]]An '''Overlay Network''' (オーバーレイ・ネットワーク ''Ōbārei Nettowāku'') is a portal created as part of an [[Xyz Summon]] in the used to travel through dimensions anywhere within ''[[Yu-Gi-Oh! ZEXAL]]'' anime and [[Yu-Gi-Oh! ZEXAL (manga)|manga]] series. It can be used for communication, as the sound also travels through them. This way, the portal stays opened until a message is transmitted or conversation is finished.[[File:Vector_traveling_through_the_Overlay_network.jpg|thumb|210px|[[Vector]] teleporting through the "Overlay Network".]]The [[Barian]] race is able to do so using it to instantly teleport themselves to another place. The [[Crest]]'s on the [[Vetrix Family]] body is able to create an Overlay Network, which then dematerializes its owner or another crest owner from one place and re-materializies them to another place. [[Quattro]] disappeared with a wind gust, [[Trey]] with a blinding light, and [[Vetrix]] with a short blackout. In [[Yu-Gi-Oh! ZEXAL II]], the [[Different Dimension Airship]] uses the Overlay Network to travel to places such as from the inside of the [[Emperor's Key]].

[[File:XyzOverlayNetwork.png|thumb|210px|left|[[Duel]]ing Overlay Network.]]According to [[Konami]], [[Xyz Monster]]s have traveled to [[Earth (planet)|Yuma's dimension]] using an "Overlay Network" from the other side of a black hole. As [[Duelists|duelists]] [[Xyz Summon]], a portal appears in which the [[Xyz Material]]s (in energy form) transfer into. The portal explodes, and the Xyz Monster unveils itself. All [[Xyz Monster]]s, with special exceptions like the "[[Number]]s", are Xyz Summoned through a red, spiraling portal. The [[Xyz Material]]s then become orbs of light which orbit the Xyz Monster. When [[detach]]ed by the [[player]], the orbs are absorbed by the Xyz Monster in its own specific way.  When a "Number" [[Monster Card|monster]] is Xyz Summoned, a space-themed portal appears into which the Xyz Materials are drawn into as energy streaks. The portal explodes, and the sealed form of the [[Summon]]ed "Number" appears, before transforming itself into its true form. However, some "Number" monsters, such as "[[Number 88: Gimmick Puppet of Leo]]" and "[[Number 33: Chronomaly Machu Mech]]" do not have sealed forms; in their case, they simply emerge from the Overlay Network. Also, "[[Number 9: Dyson Sphere]]" does not emerge from the Overlay Network, but materializes in space.