The Invasion Begins with the End of the World

is the twentieth episode of Kamen Rider Gaim.
==Synopsis==
Takatora shows Kouta the truth behind Helheim Forest, at the same time Kaito would learn the same thing from Ryoma, Sid, and Yoko. Meanwhile in Zawame City, more Inves invade and it's up to Mitsuzane and Zack to stop them.
==Plot==
Takatora guides Kouta to an ancient city deep inside Helheim Forest, revealing that the place must be the home of an alien civilization that was destroyed when the forest's plants had spread through it, transforming all life into Inves after they ate the fruit. Meanwhile, Ryoma reveals this information to Kaito, as well, and adds that the Yggdrasill Corporation is just a front to cover their real purpose, which is to prevent the Helheim Forest from taking over the world. Kaito also discovers that the Yggdrasill Corporation is using the sacred tree from Mai's family's shrine to open a Crack into the Helheim Forest, much to his anger, and Ryoma reveals that the tree is not of this world, thus making it necessary for their goals. Elsewhere, Armored Rider Knuckle defeats some Inves, but fails to protect some passerby from being infected, when Oren and Jonouchi appears to try to turn the public against him, just to be interrupted when more Inves appear. Back at Helheim Forest, Takatora claims that should Yggdrasill fail to stop the plants' invasion, they could at least buy around ten more years for mankind and only those capable to fight it must know the truth until the last moment in order to prevent further chaos in the world, but Kouta disagrees. When more Inves appear to fight them, Zangetsu Shin defeats the monsters by himself, as Gaim is unsure about fighting them, knowing that they were once ordinary living beings. When Ryoma finishes his explanation, Kaito claims that instead of just protecting the weak, they should take advantage of the situation to ensure that only the strong survive, and Ryoma, Sid and Yoko all reveal that they have the same intent, despite the Yggdrasill Corporation's goals in mind, welcoming him among their ranks.
==Cast==
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*: KANON
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===Guest cast===
*Yggdrasill Employee: , 
*Dancer: , , , 
==Lockseeds==
*Lock Used:
**Gaim:
***Orange
**Ryugen:
***Budou
**Bravo:
***Durian
**Knuckle:
***Kurumi
**Zangetsu Shin:
***Melon Energy
*Arms Change:
**Gaim:
***Orange Arms
**Ryugen:
***Budou Arms
**Bravo:
***Durian Arms
**Knuckle:
***Kurumi Arms
**Zangetsu Shin:
***Melon Energy Arms
==Notes==
*As part of Super Hero Time, this episode aired alongside episode 3, .
*Viewership: 4.6%
*Closing Screen Lockseed Collection:
**Kamen Rider: Baron
**Lockseeds: LS-08 Banana, LS-10 Suika, LS-11 Mango, LV-02 Rose Attacker, LS-03 Dandeliner
*This episode begins the Helheim Saga, the third story arc of the series.
*This is the first episode where Gaim does not transform into Jimber Lemon Arms since its debut in episode 16.
*This episode reveals what Mitsuzane saw during his visit to the Helheim Forest with his brother back in The New Arms! Jimber Lemon is Born!.
*This episode marks the first time an Armored Rider and a Genesis Armored Rider transform together.
==DVD releases==
Kamen Rider Gaim Volume 5 features episodes 17-20: The Peach Rider, Marika, Descends!, Farewell, Beat Riders, The Gifted Secret Weapon, and The Invasion Begins with the End of the World. http://www.toei-video.co.jp/DVD/gaimu.html
DSTD08895-d.jpg|Kamen Rider Gaim Volume 5, DVD cover
Gaim DVD Volume 05.jpg|Kamen Rider Gaim Volume 5, Blu-ray cover
==External links==
*TV Asahi's official summary for 「世界のおわり はじまる侵略」
*Toei TV's official episode guide for 「世界のおわり はじまる侵略」
==References==
Category:Kamen Rider Gaim