Names：

Crossbone Gundam X-1 Kai

（XM-X1）（Pirate Gundam X1 Kai）
Status： MS of Crossbone Vanguard
Tags： Mobile SuitPrototypeGundam SeriseSeparableRepair TypeCrossbone Vanguard
World： the World of Mobile Soldiers
Works： Mobile Suit Crossbone GundamUniversal Century Series
LeveL： A

Following a fierce battle with the Jupiter Empire's Death Gale Squadron, the XM-X1 Crossbone Gundam X-1 was badly damaged. During its repair, the Crossbone Vanguard engineers took the opportunity to give the machine a slight upgrade as well. This change consists primarily of the addition of the screw whip, stored in the rear skirt armor. Designed to counter the EMS-VSX1 Quavarze's snake hands, the screw whips are not as powerful as the snake hands but are still effective weapons. However, the scissor anchors of the original X-1 had to be removed as the storage space for their chains was needed to house the whips.

After returning to battle, Kincade Nau and Crossbone Gundam X-1 Kai were able to defeat the Death Gale Team. However, Kincade is forced into battle against the Earth Federation's mass-produced F91 Gundam F91 units, as well as being attacked by his former ally, Zabine Chareux. The heavily damaged X-1 Kai is overpowered by Zabine's XM-X2ex Crossbone Gundam X-2 Kai, and is sent hurtling into the Earth's atmosphere. Several days after the battle, Kincade and the X-1 Kai reappear just in time to help Tobia Arronax's XM-X3 Crossbone Gundam X-3 repel the Death Gale Team on Earth. After reuniting with the Crossbone Vanguard, Kincade goes on to destroy the massive Jupitris 9 and deal the deathblow to Crux Dogatie's EMA-10 Divinidad by using the screw whips to pierce the heavily armored cockpit. After the first Jupiter Conflict ends, Kincade entrusts the X-1 Kai with Tobia. A few years later, The X-1 Kai would be modified once again, into the "Skull Heart".

Following a fierce battle with the Jupiter Empire's Death Gale Squadron, the XM-X1 Crossbone Gundam X-1 was badly damaged. During its repair, the Crossbone Vanguard engineers took the opportunity to give the machine a slight upgrade as well. This change consists primarily of the addition of the screw whip, stored in the rear skirt armor. Designed to counter the EMS-VSX1 Quavarze's snake hands, the screw whips are not as powerful as the snake hands but are still effective weapons. However, the scissor anchors of the original X-1 had to be removed as the storage space for their chains was needed to house the whips.

After returning to battle, Kincade Nau and Crossbone Gundam X-1 Kai were able to defeat the Death Gale Team. However, Kincade is forced into battle against the Earth Federation's mass-produced F91 Gundam F91 units, as well as being attacked by his former ally, Zabine Chareux. The heavily damaged X-1 Kai is overpowered by Zabine's XM-X2ex Crossbone Gundam X-2 Kai, and is sent hurtling into the Earth's atmosphere. Several days after the battle, Kincade and the X-1 Kai reappear just in time to help Tobia Arronax's XM-X3 Crossbone Gundam X-3 repel the Death Gale Team on Earth. After reuniting with the Crossbone Vanguard, Kincade goes on to destroy the massive Jupitris 9 and deal the deathblow to Crux Dogatie's EMA-10 Divinidad by using the screw whips to pierce the heavily armored cockpit. After the first Jupiter Conflict ends, Kincade entrusts the X-1 Kai with Tobia. A few years later, The X-1 Kai would be modified once again, into the "Skull Heart".