Zackaria led the Imperial Senate's forces in The Battle for Kethlan. His original intention was to capture Minotaur, whilst eliminating the remainder of the Emperor's forces. However, when the battleship was destroyed, Zackaria masterminded the theft of Dragon.

Following the fall out of Operation Menelaus, Zackaria met with Anthony Hawke, intending on using Ifrit to trick Griffin into believing that a rescue party had arrived at the Phylent system to assist them. In the battle that ensued Zackaria was spaced from the bridge of CSN Ifrit when Simon Dodds attacked it.

Though he was exposed to the vacuum of space, Zackaria apparently survived the attack and now holds a grudge against Simon Dodds. He was rescued by transport shuttles that departed CSN Ifrit and fled with Dragon and the remainder of the Imperial forces.

Jason Zackaria joined the invasion of Mythos after learning about Ifrit being shot down and the White Knights being amongst the evacuees. He found Simon Dodds in the north of New Malaga, as the pilot was trying to free himself from an overturned Sabretooth and escape the fighting.

Zackaria felt extreme anger towards Simon Dodds when he found him, having held a grudge against him since the pilot had spaced him during the battle in Phylent. He considered that Dodds had humbled him before his troops and had decided against forcing Dodds to join the Mission, intending on killing him there and then, instead. He was prevented from doing so when a bomb strike on the plaza caused his bodyguards to evacuate him from the area.

He gave Julian Rissard a dressing down after discovering that he had tortured and beaten Kelly Taylor and Enrique Todd, dismissing him from the task of guarding the two. He ordered for Enrique to be given medical attention and then had the two pilots fed and allowed to relieve themselves.

He fled the Coyote system when the facility that Enrique and Kelly were being held at was attacked, ordering in a nuclear strike on the planet shortly thereafter.

Zackaria's encounter with Simon Dodds was significant as he was the only person outside of the Pandoran army that Zackaria had spoken to in a number of years. Kelly Taylor attempted to address him when he came to her cell, but the man largely ignored her.