Grax Communications Facility

The Grax Communications Facility is a former Nebulan industrial complex converted to communicate with faraway planets by Grax.

Marvel The Transformers comics
After finding the coordinates of Cybertron from the Autobots they desired off Nebulos, Zarak and Krunk sent a signal to Cybertron from the Grax Communications Facility, using the attached hyper-galactic tranceiver, hoping to establish communications. Scorponok's Decepticons received the signal and took the opportunity to travel to Nebulos, seeking to destroy the Autobots and conquer the planet. The Decepticons arrived at the Facility, making clear to Zarak that they had little concern for the Nebulans.

After being defeated by the Autobot Headmasters, the Decepticons made home at the Facility, keeping Zarak and his conspirators in a cage and using them for experiments, such as polymer alloy bubbles. When further Decepticon failure became apparent, Scorponok became amendable to dealing with Zarak to take care of the Autobots. To this effect, Zarak sent a videomatrix message through Llyra, his daughter, alerting the Nebulans of his captivity at the Facility. The Autobots fell into the trap, as the Decepticons revealed themselves to have also undergone the Headmaster process. In the confusion, Llyra and other Nebulans observing on board a council hovercraft were shot down and hypnotized by Mindwipe to enter the Facility, where they were trapped in polymer alloy bubbles. The Nebulans managed to escape, but the Autobots were defeated.

Regeneration One
In his attempt to create new bodies for the heads of the Autobot Headmasters that were left behind on Nebulos, the scientist Borx recovered some of Scorponok's encoded files from the Grax Communications Facility, which allowed him to experiment with an upgraded 2.0 version of the process. Unfortunately, this awoke the head of Scorponok who was able to control the minds of the Nebulan scientists into building a new body for him as well.

The resurrected Decepticon leader would continue to use the Grax Communications Facility as his base of operations, holding the Dinobot Grimlock captive there. After apparently convincing Grimlock to join him in his conquest of Cybertron in exchange for a new Nucleon-free body, Scorponok revealed that he had been working on a Gene Key capable of turning Autobots into Decepticons and introduced Grimlock to his new troops—Highbrow, Hardhead and Brainstorm! The five Transformers then left the Grax Communications Facility for Cybertron.

Ask Vector Prime
In Primax 1086.0 Kappa, the remnants of Transformers defeated by the Nebulans were transported from the Arvassian mountain range to Grax's industrial facility by Mortilus Zarak. There, Hi-Test and Vorath managed to merge the bodies into Zarak Maximus.