Invaders

Invaders are parasitic entities born of over-exposure to Getter Rays. They serve as the main antagonistic force of the OVA Getter Robo Armageddon.

Appearance

They typically resemble black reptilian-esque creatures with metallic teeth and claws, but are capable of potentially morphing into any possible form. They infect both organic lifeforms and machinery and subvert them to their own twisted ideal of evolution. While humans become Invaders, mechs become known as Metal Beasts (a name borrowed from Getter Robo Go).

Abilities and Behavior

Infected humans not only show maniacal obsessions with misconcieved ideas of Darwinian evolution, but also display physical features associated with Invaders in either the area of infection or the first post-infection open wound. Infected machines typically display Invaders squirming out of open joints, with one notable exception. Although individuals like Michiru Saotome and Dr. Saotome can apparently display some resistance to the infection process, the only way to deal with an infection is either stressing the new Invader with weaponry like a Getter Robo's physical weaponry or overloading the victim with concentrated Getter Rays to the point where they start to burst. Temporary means of dispatching Invaders include a presumably electric barrier that is installed in the Tower and freezing them with liquid nitrogen, although the former method lasts as long as power can be supplied to whatever generates this 'force field' and the latter requires handling a liquid that can be potentially as lethal as an Invader due to its extremely low temperature (the maximum temperature being 77° K, -196° C, or -321° F); and the coating will eventually melt, as Benkei points out to Kei. Notably, the modified human known simply as Go can repel Invaders; although this is only shown in the third episode (likely due to a directorial shift between the first three episodes and the subsequent episodes). The size of Invaders can vary between nanoscopic and that of an average gas giant of the outer solar system as displayed in both the various Invaders that melded with Getter Robo G to form MetalBeast Dragon and the massive beast seen at the end of the series that house the conciousnesses of Cohen and Stinger. Aside from twisted morals, the memories and personalities of any infected are preserved, as shown by Dr. Saotome and his former coworkers who were dispatched 13 years prior by Cohen and Stinger.

Trivia

• Notably, certain Metal Beasts resemble some of Dr. Rando's creations in Getter Robo Go.
• The Invaders' origins in Getter Rays, their variable sizes, and their infectious nature could be a reference to Shin Getter Robo's appearance in the Gettter Robo Go manga where it melds with the advanced Mechasaurs, its pilots, and the Earth itself before flying to Mars while displaying little certainty as to its definite size.