Emperor Zurg

Emperor Zurg (also known as Evil Emperor Zurg or simply Zurg), The Sworn Enemy of the Galactic Alliance, is one of the main antagonists in Buzz Lightyear of Star Command: The Adventure Begins and the arch enemy of Buzz Lightyear. He is a minor villain in Toy Story 2 and the major villain in Buzz Lightyear of Star Command: The Adventure Begins. He makes a cameo appearance in Toy Story 3.

Toy Story
Zurg does not actually appear in the first Toy Story; however, he is only mentioned by Buzz two times in the film. As he introduces himself to the toys, Buzz describes his "occupation" as a member of an elite universal protection unit to protect the galaxy from Zurg. Later, when Buzz and Woody argue at a gas station, Buzz mentions about Zurg building a secret weapon with enough power to destroy an entire planet, making a reference to the Death Star from Star Wars Episode IV: A New Hope. Andy also mentions Zurg when he plays with Buzz on his birthday. His appearance is only shown in one of Andy's drawings, although his head is obscured by another drawing.

Toy Story 2
Zurg appears in two forms in Toy Story 2. The first form appears during the opening sequence, where he is initially seen tracking Buzz's location through his fortress inside his control room. A little later, he is seen doing battle with Buzz, in which Zurg, using his ion blaster, blasts the top half of Buzz's body into smithereens; however, the opening sequence is revealed to be only a video game.

Much later in the film, an incarnation of Zurg is later accidentally released by Andy's Buzz Lightyear in Al's Toy Barn. Believing himself to be real much like Andy's Buzz has done in the first film, he pursues after Andy's Buzz to destroy him. He seems to have followed Andy's Buzz across the street, through an air vent of Al's apartment, and up the elevator shaft as he is seen arriving atop the elevator when Andy's Buzz and his rescue squad of toys head back to the elevator after Al packs Woody and the Roundup gang into his case and leaves his room to head for the airport. Along with the group is another Buzz Lightyear action figure (also released from Al's Toy Barn by Andy's Buzz Lightyear), who also believes himself to be real. Both Buzz #2 and Rex, a fan of the video game "Buzz Lightyear: Attack on Zurg", are caught with surprise by Zurg's unexpected arrival. A showdown occurs between the Buzz #2 and Zurg atop an elevator, where Zurg uses his chief weapon (which appears to be a Nerf ball gun.) During this battle, after overpowering the other Buzz, Zurg reveals he is Buzz's father (a parody of the duel between Darth Vader and Luke Skywalker from Star Wars Episode V: The Empire Strikes Back). As Zurg sets his gun to his highest level and is about to finish Buzz #2 off (at point-blank range), Rex, not bearing to watch the duel anymore, turns away, but his large thick tail hits Zurg, knocking him down the elevator shaft. While Rex finally feels excited about finally overcoming his frustration toward not being able to defeat Zurg previously, Buzz #2 suddenly feels forlorn about losing his father. Zurg seems to have survived the fall as he, with one of his horns slightly bent backwards, is seen playing catch and spending "quality time" with Buzz #2 when Andy's Buzz and his rescue squad make their way out of Al's apartment. The Buzz #2 describes Zurg as a "great dad" as he rushes to catch another ball fired by Zurg.

Zurg's name is mentioned once again by Andy (after he returns home from Cowboy Camp to see Jessie and Bullseye added into his collection) as a polecat who has stolen his space cows.

Toy Story 3
Zurg is mentioned again by Buzz, who sees Andy's toys as minions of Zurg after Lotso turns him back to his original settings, which is one of the indicators to Andy's toys that Buzz thinks he's a space ranger again.

At the end of the film, when Andy introduces Buzz to Bonnie, Andy mentions Zurg, from whom Buzz is sworn to protect the galaxy from. Zurg makes a brief appearance in the end credits of Toy Story 3, where he is shown being donated to Sunnyside Daycare in a box along with a dinosaur, a giraffe plush, and two Fisher-Price Little People. He is helped down to the floor by Stretch and meets Ken and Barbie, who welcome him to a now cool and groovy Sunnyside, of which the two are leaders. He is later seen doing the robot dance.

It is unknown if this is the exact same Zurg figure from the second film or a different one.

Buzz Lightyear of Star Command
Zurg is the main villain of the series Buzz Lightyear of Star Command, in which he rules over Planet Z and wants to take over the entire universe. His subjects are Grubs, which are similar to Star Command's Little Green Men, Brain Pods, who work for him as scientists and researchers, and an army of Hornets, which are his robotic foot soldiers used for battle. One of his henchmen is Warp Darkmatter, who was once Buzz's partner but had been secretly working for Zurg and given the codename "Agent Z." This incarnation of Zurg is a flamboyant villain who often breaks the seriousness of his evil statements, and is just as much a comic relief character as he is a formidable opponent. He is known for videotaping Buzz's speeches so he can secretly mock him, and in one episode tells Buzz that he is his father during a fight (just like he did in Toy Story 2) only to gain the upper hand by using the statement as a "Made You Look" moment to trick Buzz, which likely implies he and Buzz may not be related. In another episode where Senate members are being kidnapped, Zurg is the chief suspect, but says to Buzz that even he considers kidnapping politicians to be ridiculous; Buzz and his crew then eliminate Zurg from the suspects. Despite Zurg's campy nature, he is still widely considered the most evil person in the galaxy.

Toy Description
From Official Website:

"The ultimate force of evil in the galaxy, terrifying tyrant Emperor Zurg is unswerving in his quest to destroy his enemy, Buzz Lightyear."

Trivia

 * Zurg appears as a playable character exclusive to the PlayStation 3 version of Toy Story 3: The Video Game, along with his custom-made car.
 * While Zurg and Buzz #2 fight atop the elevator, as the talk button of Buzz #2 is repeatedly hit, it skips the message "Buzz... Buzz... Buzz Lightyear to the rescue," which also happens when Woody and Buzz fight underneath Andy's car at the gas station in Toy Story.
 * When looking at the shot where Zurg is about to finish the Buzz #2 off, it is noticeable that the levels on his gun are numbered to 11, a reference to Nigel Tufnel's amplifier in This is Spinal Tap.
 * Zurg's character may appear to draw from Darth Vader, a main villain in the Star Wars original trilogy, with a similar voice, appearance, and set of mannerisms.
 * The character may also be based on Emperor Ming in the 1980 film Flash Gordon, because he sports a cape similar to that of Ming's and is referred to as "Emperor".
 * During Woody's nightmare earlier in the film, some of the the mismatched toy arms in the trash can Woody was discarded in belonged to Zurg (although there were a couple color variations).
 * Zurg was based partially off Toy Story 3 director Lee Unkrich's favorite toy, the Six Million Dollar Man.
 * The "Zerg" faction in the Blizzard produced computer game Starcraft originally had their name spelled identically to Emperor Zurg's during the game's earlier builds. However, in order to avoid possible copyright issues, the faction later had it's name re-spelled with an "e" instead of a "u."
 * According to concept art, Zurg is really just a small alien in robtic armor.
 * In the Buzz Lightyear of Star Command intro, Zurg is seen in Andy's room that possibly means that Andy might've had a Zurg toy or borrowed one from a friend at one time. However, it is unknown what happened with it, but most likely it was donated, given back (if it was indeed just borrowed), sold, or thrown away during the events between Toy Story 2 and Toy Story 3. It is also unknown what relationship he had with Buzz. On the other hand, however, this may just be non-cannon.
 * In the Buzz Lightyear episode The Lightyear Factor, Zurg enters an alternate universe where he finds an Evil Buzz Lightyear ruling the galaxy. The Zurg from that universe was a burger guy at Cosmo's restaurant, not having what it took to be Ultimate Evil.
 * Buzz #2 spending "quality time" with Zurg may possibly be a reference to Kevin Costner's character Ray Kinsella reunited and playing catch with his father in the final scene of "Field of Dreams."
 * In World of Cars Online Zurg has a cameo where he is depicted as a train in an arcade game.