Season Four (Agents of A.C.E: International)

Season Four is the fourth season of Agents of A.C.E: International, released in 2025. It is preceded by the special episode Sins of the Grandfather, and is succeeded by Season Five. This season follows directly on from the special, with Jason Manster returning as the primary antagonist, possessing Jackson Hawksby’s body. It also features a secondary main antagonist, being the resurrected Lucia Manster. The season does not focus on any particular agent, however Keira Hawk and Melanie Asher are main focus characters, alongside Lucas Thorpe.
== Synopsis ==
In the wake of the murder of Nathan Maxwell, the Agents of A.C.E are tested by the return of their most deadly enemies - Jason and Lucia Manster. To make matters worse, the body of longtime A.C.E hero, Jackson Hawksby, is possessed by Jason, in the deadliest struggle yet for Mel and her Agents. 
== Cast ==
* Melanie Asher
* Lucas Thorpe
* Keira Hawk
* Hope Williams
* Christopher Warren
* Fenkor
* Jackson Hawksby/Jason Manster
* Lucia Manster
* Kieron Hawk (supporting)