"Chrysalis", known as "Cocoon" (ＣKokūn) in the OCG, is an archetype of monsters used by Jaden Yuki in the Yu-Gi-Oh! GX anime that contains a small group of infant monsters shielded in cocoons that resemble smaller and younger versions of the "Neo-Spacian" monsters. The cocooned monsters can be released by a number of methods. Commonly, each "Chrysalis" monster can be Tributed when the Field Spell "Neo Space" is on the field to Special Summon a specified "Neo-Spacian" monster from either your hand or your Deck. There are six "Chrysalis" monsters with different Attributes and Types, and each one has 200 ATK and DEF, and 1 Level, less than its corresponding "Neo-Spacian" monster. All "Chrysalis" monsters, except "Chrysalis Dolphin", have the same type as their "Neo-Spacian" counterparts.
Despite the TCG version changing this archetype's name to "Chrysalis", many of the support Spell and Trap Cards still feature the word "Cocoon".