The Gargantua is approximately six meters (20 feet) tall, mostly blue in color, and has one yellow eye that glows red when it perceives a hostile unit. Instead of hands, it sports two massive pincers that can be opened to emit jets of intense heat (the Alien Grunt hands are also similar), as well as a pair of vestigial legs below the trunk,[1] a common trait in most bipedal Xen creatures.

The creature has a thick shell or carapace that renders it completely bulletproof. (Stolen from the wiki)