The third and final entry of Machinima's Transformers: Prime Wars web series is adding some impressive star power to its voice cast, as Mark Hamill and Ron Perlman are joining the cast. Hamill will be voicing the series' ancient villain Megatronus starting in the finale of the currently-running series Transformers: Titans Return. Perlman is lending his pipes to the heroic Optimus Primal and will make his debut in the final chapter of the trilogy, Transformers: Power of the Primes.

A co-production between Hasbro and Machinima, The Prime Wars Trilogy has been a huge success, boasting a massive international audience. The first series, Combiner Wars, showcased some of the most iconic combiners in the Transformers mythos, like Devastator, Predaking, and Computron. The followup, Titans Return, saw Cybertron menaced by the massive city sized Decepticon Trypticon, who faced off with the similarly hulking Autobots Metroplex and Fortress Maximus.

Related: Transformers Series ‘Titans Return’ Secures a Star-Studded Cast

The final entry in the series is upping the ante even further, with a voice cast to match. Power of the Primes features the return of Megatronus, one of the original thirteen Primes who splintered from the others and founded the Decepticons. Essentially a god, Cybertron's heroes will have to enlist some serious reinforcements to survive, which comes in the guise of Optimus Primal, the benevolent gorilla Cybertronian made famous by the classic Beast Wars cartoon. Hamill and Perlman join an already impressive voice cast, stocked with Transformers fan favorites like Judd Nelson, who reprises his role of Rodimus Prime from the 1986 animated movie, and Gregg Berger, who's been the voice of Grimlock since the original Generation 1 cartoon. Wil Wheaton of Star Trek: The Next Generation also reprises his role of Perceptor from Titans Return.

Hamill, fresh off his career best performance as a grizzled Luke Skywalker in Star Wars: The Last Jedi, is no stranger to the robots in disguise. He voiced a few different characters in the preschool-aimed series Transformers: Rescue Bots, and portrayed a Vehicon in promos for the dearly departed Hasbro network The Hub. Perlman is a newcomer to the world of Transformers, but has done extensive voiceover work in shows like Adventure Time and Archer.

Booking Hamill to play the villain of their climactic story is something of a coup for Machinima. The previous installments have lacked a central, foreboding villain - Trypticon's massive, but he's not exactly brimming with personality. Having Hamill voice the progenitor of the Decepticons is an appropriately epic way to wrap up this story, which has become a fairly dark spin on post-war Cybertron, echoing the popular IDW comics that have tread similar storytelling territory in recent years. The Prime Wars Trilogy has been calibrated from the very beginning to appeal to hardcore Transformers fans, and enlisting such a strong voice cast for the finale suggests they know it's important they stick the landing.

MORE: Peter Cullen Discusses His Legacy Voicing Optimus Prime

Transformers: Power of the Primes debuts on go90 in Spring 2018.

Source: Machinima/Hasbro