Alien

"Blarg Blarg Blarg Honk"

-the only thing he ever says

First appearing in the end of Season 3 and onto Season 4, The Alien is an Elite in blue armor, but never identified as a Covenant. He speaks in blargs and honks, which are only understood by Andy. As for his actual name, he is referred to as "Crunchbite" by Caboose after he bit him, but no one actually figures out what his real name is. Andy suggested the name "Crouch-a-saurus"

Role in the Plot
The Alien first appeared at the end of Episode 57, and scares Church out of his body, wiping out Lopez's robot army and single-handedly defeated O'Malley. The Blues attempt to hunt him down, but they suffer a series of defeats, Even Tex is cut down seconds after attempting to attack the Alien and is forced to flee her host body. Eventually, Caboose manages to befriend the Alien, who had found him unpalatable after biting him once. Conversely, the Alien has a strong odor to the Blues, who describe the smell with a series of unpleasant analogies. At one point. the Blues attempt to communicate with him/it, and after many attempts, try to teach him English ("English 101: Remedial Kick-ass" according to Tucker).

The Alien was on a quest to obtain "the salvation and emancipation of his entire species for all eternity," as stated by Andy. He went to the Wind Power Facility to obtain the Great Weapon, a sword-like key. After seeing that Tucker had already taken the weapon, the Alien burst into a rage and attacked him, due to the weapon locking itself to the first user. It then forced Tucker to follow it on a quest to fulfill The Great Prophecy. Tex, Tucker, Caboose, and Andy then followed it through the Great Burning Plains of Honka Hill, the Great Swamp, to the Great Freezing Plains of Blarganthia. It was there that the Alien had Tucker unlock a gate leading to a ship. It quickly boarded the ship, saving the Blues from a sneaking grunt, but was killed by Agent Wyoming.

The Alien was not to be forgotten though, as it had infected Tucker with a parasitic embryo, which became Junior.

Trivia
In one of the alternate endings to Season 5, it is explained that Caboose created his own video game idea after BGC, and sold it to a video game franchise (Bungie) and his game was very popular (Halo). It is very possible that the Alien was his inspiration for the Arbiter, as like in Halo, they worked together on a "Holy Quest" in both scenarios. For one episode Blue Team debates about Crunchbite's true name. He seemed to respond to Honk Honk but after that episode it seemed nobody paid any attention to what is believed to be the Alien's true name.

A similar alien drives Smith over to the Unknown Elephant Driver in recreation episode 9. This may or may not be The Alien.