Ben 10

This is the first appearance of Tetrax and SixSix.

Second and first appearance of Diamond Head since "And Then There Were Ten." Second appearance of Ghostfreak and Grey Matter.

Ben claims his experience as Ghostfreak, in this episode, was even weirder than previous times he's used him. Either he's referring to the effect of Kraab's chemical, or this could be slightly subtle foreshadowing to "Ghostfreaked Out."

Ben's transformation into Diamond Head is different from how it was in "And Then There Were 10." His skin now shines brightly before the diamonds cover his body, and the spikes are seen coming out of his back.

We get to see what Ghostfreak's innards look like in this episode, via Kraab's visor.

This is the first time we see Ben use one of the aliens more than once in the same episode (Diamond Head).

Tetrax is about as tall as Grandpa Max.

This is the second appearance of Vilgax.

The RV gets damaged twice in this episode. These damages include: 1) Broken fuel line 2) Flat tires

While Diamond Head's eyes are yellow, Tetrax's are green, showing us that it's not just humans who have different eye colors. Tetrax also has no back spikes (although having them would have been too much of a giveaway).

This marks the first time Ben meets an alien of the same species as ones from the Omnitrix. He meets Tetrax, an alien of the same race as Diamond Head.

Cartoon Network (UK) airdate: Saturday, March 25th, 2006.

This is the first episode where Ben uses less than four transformations.

This episode is based on having Ben learn that brains are better than brute strength. In the end, he chooses the weaker alien, in this case, Grey Matter, to stop the bounty hunters, instead of the stronger one.

Tetrax gives Ben his hoverboard at the end of the episode.

Grandpa Max shows that he is able to jump far distances, despite his age and weight.

Kraab explains that Ghostfreak's body is made out of a protoplasm that can change its density. The slime he shot Ghostfreak with solidified that protoplasm, rendering him useless. Click here for more information.

Main Transformation(s): Diamond Head.

Kraab spins his legs in much the same manner as the giant robot droid in the first episode. They even use the same sound effect when this happens.

Additional information about the Omnitrix is revealed, in which it's now known, that the Omnitrix uses alien DNA that binds to the host's genetic structure. This explains why the Omnitrix won't simply come off, as well as being the most powerful weapon in the galaxy and the key to an epic battle between good and evil.

Main Villain Bios: 1) Sixsix - One of the three alien bounty hunters sent by Vilgax to take the Omnitrix from Ben, and the only one who doesn't speak English, but rather a foreign alien language. He has purple armor and strange, clamp-like feet. He also has a jet-pack on his back. His armor is covered with pockets containing various weapons and tools. He also has several claws and an extra hand that extend from his back. 2) Kraab - One of the three alien bounty hunters sent by Vilgax to take the Omnitrix from Ben. As his name suggests, he resembles a fiddler crab. He has gold armor, a sideways mouth, four scythe-like legs, and a large, powerful pincer on his left hand. Within the pincer is a powerful blaster. He also carries a rarely-used sword on his back. He can spin his four legs and burrow his way through the ground to move quickly between places.

Ben learns the actual name of the Omnitrix in this episode.

Main Ally Bio: Tetrax is from the same alien race that Ben's Diamond Head form is based on. He wears a nearly impenetrable suit of grey armor and carries an extremely powerful rifle. He uses a hoverboard for transportation. Unlike the other mercenaries, he intends to retrieve the Omnitrix in order to fight against Vilgax.

Ben manages to keep the Omnitrix, in spite of the three expert bounty hunters hired by Vilgax to retrieve it.

New Alien Abilities: 1) Diamond Head can fire diamond projectiles from out of his hands. 2) Ghostfreak can move his eye throughout the black lines on its body. He can also make a person shiver when he passes through them. 3) Grey Matter has been shown in action in this episode and this is the first time that Grey Matter has actually defeated an opponent. It is also revealed that he is indeed intelligent and knowledgeable in technology.

Alien Form(s) Used: 1) Diamond Head. 2) Ghostfreak. 3) Diamond Head (2nd time). 4) Grey Matter.

Main Villain(s): Kraab & Sixsix.