Neo-Geildon is an evil "embodiment clone" created by Space War God Borudosu and one of the two secondary antagonists in the film Zyuden Sentai Kyoryuger vs. Go-Busters: Dinosaur Great Battle! Farewell, Eternal Friends.
Not the original Darkness Messenger Geildon who was Mahoro's brother and Asuka's childhood friend who died rather early in the invasion from Dino-Earth of Invasion Garden Evolian, he is an evil embodiment of the regret of the Evolians in their failure to defeat the Abaranger in the past.
Neo-Geildon and his partner, Neo-Grifforzer, were created by Space War God Borudosu for the purpose of gathering enough Dino Hope to revive it. They were joined by resurrected Vaglass members Enter and Escape, who had been revived due to a Vaglass restoration program activated by Borudosu.
Neo-Geildon and Neo-Grifforzer brainwashed Tyranno Ranger and AbaRed of the Zyurangers and Abarangers respectively to serve them However, they were later freed by the power of Dino Hope. Ultimately after the defeat of Borudosu, Geildon uses the collected energy from Geki and Ryouga to transform into Neo-Messiah, an embodiment clone of the Go-Busters' enemy Messiah. It is in this form he is defeated by a new Sentai team, the ToQgers.