Card Appearances:Cocoon of Evolution

"Cocoon of Evolution":

Yu-Gi-Oh!

In episode 5, Weevil Underwood used this card during his Duel against Yami Yugi. He equips this card to "Larvae Moth" as part of his plan to summon ultimate monster. This causes the ATK of "Larvae Moth" to become 0 and its DEF to become 2000. "Larvae Moth" then gained a Field Bonus from the Forest field. Yugi later gets rid of the forest field with a combo involving "Curse of Dragon" and "Burning Land". This reduces the DEF of "Larvae Moth" to 2000. "Gaia the Fierce Knight" then attacks and destroys "Larvae Moth". Although Yugi was able to destroy "Larvae Moth" with "Gaia the Fierce Knight" a turn early, Weevil was able to summon "Great Moth" in place of "Larvae Moth" since the latter was equipped onto this card for four turns.
- It was mentioned during the Uncut edition of Yu-Gi-Oh!, as well as the original Japanese-language edition, that with "Cocoon of Evolution" on the field, Weevil was unable to play any additional cards until Cocoon had evolved.

In episode 45, Three of these cocoons were seen in the Legendary Heroes Arc. After Yugi activates "Mirror Force" to protect the group from attacking insects, it created a bunch of explosions that created a fire that disturbed the Cocoons. The Cocoons then hatched into "Great Moths", but Yugi summons "Catapult Turtle" and "Kuriboh". "Catapult Turtle" then launches "Kuriboh" at the "Great Moths". Yugi then activates "Multiply" to turn "Kuriboh" into a "Kuriboh" swarm. The swarm then self destruct on the "Great Moths", destroying them.

Weevil later used this card in his Duel against Joey Wheeler. He equips this card to "Larvae Moth" as part of his plan to summon his ultimate monster so that way Weevil could summon his ultimate monster. This causes the ATK of "Larvae Moth" to become 0 and its DEF to become 2000. Weevil forgot that his "Larvae Moth" was in Attack Position once it was Joey's turn. "Little-Winguard" then attacks "Larvae Moth", but Weevil activates "Insect Barrier" to render all attacks made by Joey's Insect-type monsters useless. As Joey's monsters had become Insect-type monsters due to "Reckless Parasite", none of his monsters could attack. Five turns after equipping this card onto "Larvae Moth", Weevil sent "Larvae Moth" to the Graveyard to summon out "Perfectly Ultimate Great Moth".

In episode 63, this card appeared on the screen of the laptop that Kenta was using when he was trying to let Serenity Wheeler know how the Duel between Joey and Weevil was going.

In episode 74, this card appeared within some of the small clips that were shown going through a black background before we see a montage of Joey's Battle City Duels.

Instead of Cocoon of Evolution being equipped to Petit Moth, the Petit Moth would be sent to the graveyard as Cocoon of Evolution would be Special Summoned in its place (The Cocoon can still be sent to the graveyard to special summon Great Moth or Perfectly Ultimate Great Moth using their effects).