Like most robots, NOS-4-A2 "bleeds" servo-fluids, has a servo-pump for his "heart", and a motherboard for his "brain".
Afterward, once NOS-4-A2's coffin had been examined by the LGMs and left in Star Command's science bay with XR in sleep-mode nearby, the vampire emerged and set off to work. Waking XR, he ordered him to release him from the force-field protecting his coffin. Due to NOS-4-A2's having bitten him previously, XR was under his control. Once free, NOS-4-A2 carried out his main directive of taking over Star Command. With a few clever ruses he successfully led all Space Rangers away from the station. Unfortunately for him, thanks to a poor choice of words while disguising his voice to sound like Commander Nebula, Buzz and Mira realized something was amiss, returned, and encountered NOS-4-A2 for the first time.
In the ensuing fight, NOS-4-A2 calls upon the help of the mind-controlled XR, whom he has dubbed "Little One", to attack them. Buzz and Mira escape and try to come up with a plan while NOS-4-A2 works to use the entire station against them. The energy vampire eventually catches up with Buzz, and the two engage in combat. In the midst of the fight, Booster catches up with XR and reminds him that he is a Space Ranger, not the slave of an energy vampire. Snapping back to his senses, XR drains NOS-4-A2's energy, powering him down.
Buzz, XR and Savy pursued him, discovering his lair and miniature shuttle that resembled a larger version of NOS-4-A2's coffin. Buzz discovered NOS-4-A2 was going after the new crystallic fusion reactor due to go online that evening and decided to intercept him there. When Buzz and XR get ready to attack, Savy does so first, leaving her vulnerable to the vampire's attack. Buzz saves her, but NOS-4-A2 drains his suit, leaving Buzz powerless as he snatches up XR and returns to his lair. Buzz and Savy once again pursue, interrupting NOS-4-A2 as he details how he will drain XR within an inch of his life and recharge him to do it all over again as his form of revenge. To stop Buzz, NOS-4-A2 reanimates the dead robots and orders them to attack him. While Buzz is occupied and the vampire attempts to make his escape with XR, Savy drives a specialized draining unit through NOS-4-A2's randometer and drains him of all his power, saving XR and Buzz.
NOS-4-A2 is arrogant; even more arrogant than Zurg. He was created and programmed to destroy Buzz Lightyear and Star Command, defeat not being in his programming. He flaunts his position and power, employs the use of minions to do his bidding, and after his first "failure" becomes his own villain, no longer taking order from Zurg.
He seems to be vengeful, as he goes out of his way to try and get revenge on XR, and obviously planned it out carefully (as he planned on slowly draining XR so he could feel all of it, and then recharge him and do it all over again).
Unlike Zurg, he seems more serious with what he does. However, like Zurg, he enjoys being evil, and seems to enjoy conquest, as he decides to take over Planet Z, Zurg's domain.
Flight: Possessing no feet or wheels, NOS-4-A2 moves around by hovering a few inches above the ground. For long-distance travels or heights more than a few meters, he uses his wings instead. His wing's skeletal structure consists of red spines, the wing itself being made up of red-colored energy when in use.
Energy Absorption: NOS-4-A2 can drain energy from robots, machines, weapons and environmental suits. Energy is his sole source of food, and serves to strengthen him. As long as his target is in close proximity, he can absorb its energy and even disintegrate weapons. However, in order to drain a machine, he has to bite it.
Mind Control: By biting a robot or a machine (or using energy on machines or robots he has already bitten) NOS-4-A2 can simultaneously drain it and hack into its systems, installing a mind control program that enables him to command it in any way he pleases.
Energy Blasts: NOS-4-A2 can fire beams of blue energy from his hands and his mouth to attack his opponents and control machines. They can temporarily stun a target.
Monocle: NOS-4-A2's left eye serves more of a purpose than a simple eye. Emitting a beam of red light, NOS-4-A2 can hypnotize robots and apply a similar type of mind control (though with limited duration) as with his bites.
Finger Rays: Although never used in battle, NOS-4-A2's fingers have been shown to be able to peel back and emit a fiery-hot beam similar to a blowtorch that can heat up and even melt some metals given time.
Voice Imitation: NOS-4-A2 can easily imitate someone else's voice.
Randometer: NOS-4-A2 had once installed a randometer in his power grid to prevent others, like XR and Savy SL2, from draining him dry. Instead, it sends a current of energy as backlash to the opponent. However, the randometer was destroyed when Savy staked NOS-4-A2 in the chest with her specialized power absorption unit.
- "Jolly good!"
- "Resist me not, Little One. For you, are mine..."
- "I am your doom. I am NOS-4-A2."
- "Defeat is unacceptable. I was programmed only for a swift and destructive victory."
- "I am NOS-4-A2. I cannot be defeated. It's not in my programming!"
- "Ew! I hate veggies!"
- "Might I please have my revenge, is that too much to ask?"
- "Oh, please stop whining. It's giving my motherboard a migraine."
- "Bleh! I never drink... blood. Argh, now I've lost my appetite completely."
- It is no secret that NOS-4-A2's name is a play on the word "nosferatu", synonymous nowadays with "vampire". In fact, he was named in homage to the vampiric character in the silent film Nosferatu, an unauthorized film adaption of the gothic horror novel Dracula.
- In a recent interview with the fans, it was revealed that Tad Stones was behind the concept, design and color scheme of NOS-4-A2's character.
- Ironically, the term "energy vampire" already existed before NOS-4-A2, but it was more commonly referred to as a "psychic vampire". These beings were reputed to feed off of the lifeforce of living creatures. The term "energy vampire" is also used metaphorically, to refer to people whose influence leaves a person feeling exhausted, unfocused and depressed, without ascribing the phenomenon to psychic interference. The term was given a more literal sense in the conception of NOS-4-A2's, as he feeds off of electrical energy.
- A Zoo Out There (no lines)
- Dirty Work
- The Slayer
- Revenge of the Monsters
- War and Peace and War (montage, no lines)
- Lost in Time (mentioned)
- ↑ 1.0 1.1 "The Slayer", Ep. 26. Steve Loter (Director) & Ken Koonce, Michael Merton (Story Editors & Writers). Buzz Lightyear of Star Command. Disney Enterprises, Inc./Pixar Animation Studios. October 31, 2000.
- ↑ 2.0 2.1 2.2 "NOS-4-A2", Ep. 06. Victor Cook (Director) & Michael A. Medlock (Writer). Buzz Lightyear of Star Command. Disney Enterprises, Inc./Pixar Animation Studios. October 8, 2000.
- ↑ Nosferatu
- ↑ The Adventure Begins DVD Bonus Content: Trivia Game
- ↑ Interview with Tad Stones: Question #20
- ↑ Psychic Vampires: Energy Vampires