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An '''Overlay Network''' (オーバーレイ・ネットワーク ''Ōbārei Nettowāku'') is a portal used to travel through dimensions anywhere within in the ''[[Yu-Gi-Oh! ZEXAL]]'' anime and [[Yu-Gi-Oh! ZEXAL (manga)|manga]] series.

[[File:Vector_traveling_through_the_Overlay_network.jpg|thumb|210px200px|[[Vector]] traveling through the "Overlay Network".]]The [[Barian]] race is able to do so using it use the Overlay Unit to instantly teleport themselves to another place. The [[Crestcrest]]'s on the [[Vetrix Family]] body is able to create an Overlay Network, which then materializes its owner or another crest owner from one place and manifests them to another location. [[Quattro]] disappeared with a wind gust, [[Trey]] with a blinding light, and [[Vetrix]] with a short blackout. <ref name="ep43">{{episode|Yu-Gi-Oh! ZEXAL|43|ref}}</ref> Later in the series, the [[Different Dimension Airship]] uses the Overlay Network to travel to places such as from the inside of the [[Emperor's Key]].<ref name=ep95">{{episode|Yu-Gi-Oh! ZEXAL|95|ref}}</ref>

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. <ref name="SD11">{{citeweb|url=http://www.yugioh-card.com/en/products/starter2011.html|title=Starter Deck: Dawn of the Xyz|publisher=[[Konami]]}}</ref> As [[Duelists|duelistsDuelist]] s [[Xyz Summon]], a portal appears in which the [[Xyz Material|Overlay Unit]]s (in energy form) transfer intoenter. The portal explodes, and the Xyz Monster unveils itself. All [[Xyz Monster]]sMonsters, with special exceptions like the "[[Number]]s", are Xyz Summoned through a red, spiraling portal. The [[Xyz Material]]s Overlay Units 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. <ref name="ep5">{{episode|Yu-Gi-Oh! ZEXAL|5|ref}}</ref> When a most "Number" [[Monster Card|monster]] is Xyz Summoned, a space-themed portal appears into which the Xyz Materials Overlay Units 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  The "Number" monsters, such as Overlay Network was also used for "[[Number 88: Gimmick Puppet of LeoGalaxy Stealth Dragon]]" <ref name="ep138">{{episode|Yu-Gi-Oh! ZEXAL|138|ref}}</ref> and was later used for "[[Number 33: Chronomaly Machu MechDark Rebellion Xyz Dragon]]" do not have sealed forms; in their case, they simply emerge from the Overlay Network. Also, "''[[Number 9: Dyson SphereYu-Gi-Oh! ARC-V]]''.<ref name="arv7" does not emerge from the Overlay Network, but materializes in space.>{{episode|Yu-Gi-Oh! ARC-V|7|ref}}</ref>