XL was originally XR's predecessor who went rogue due to faulty programming. Ever since being reactivated after his decommission, XL has sought revenge against Star Command. He usually worked solo, as well as cooperated with a number of criminals. He was finally allowed to return to Star Command at Buzz Lightyear's insistence after turning on NOS-4-A2.
XL is what has been described as a "Frankenstein's monster" sort of robot; he possesses a head similar to XR's, but red, and with smaller, beady eyes.
His original Star Command body was a near exact duplicate of the one XR has except for having only one tread and a more rectangular dome.
His pieced together body contained parts from several different robots, all connected to a huge body, giving him an intimidating look.
HistoryLGMs to be the first robotic Space Ranger, but due to his violent and destructive personality, Commander Nebula gave the command for XL to be shut down. This event was what led to Nebula's prejudice against robots and the idea of a robot ranger in particular, though like XR after him the LGMs got permission to build him by sneaking the authorization forms in with their vacation requests. Some time after XR was built, the Evil Emperor Zurg reactivated him, and XL had every intent to take revenge upon Nebula for shutting him down. Stealing parts from various robots and top-secret facilities, he built himself a new body before going to Star Command in search of Nebula.
Furious after being defeated by XR, XL examined their blueprints and determined that only one component appeared to be different between them: XR possessed an "AFD." Believing the component to be the cause of his defeat, XL captured XR and removed it, installing it in himself. Later, he captured XR again after his "younger brother" took a delivery job in hopes of being able to obtain a replacement. XR ended up bringing XL the final component for his latest evil invention, a dangerously modified version of a Star Command g-force trainer. XL put XR in the machine and set it running, capturing the rest of Team Lightyear when they arrived to rescue their friend. However, the investigations of XR's teammates led to a surprise revelation: AFD stood for Air-Freshening Device, installed by the LGMs due to their dislike of how XR smelled. Realizing that he had not lost a vital component, XR threw several coins out as he was being propelled by the g-force machine, destroying it and damaging XL.
XL later hired Torque to bring him a special component on Tradeworld, which allowed him to upgrade himself with more powerful robotic limbs. Though he initially posed a considerable threat to Team Lightyear, he was defeated yet again when Booster Munchapper, under the influence of Jo-Adian Bunzel Fever, ripped him apart after mistaking him for a Bunzel.
In yet another plot to get revenge on Star Command, XL kidnapped XR and stole his body, disguising his head so that he could impersonate his younger brother and infiltrate Star Command. Succeeding in doing so, he planted a bomb intended to destroy the station, but found himself unable to escape. Mistaken for XR, who, due to a misunderstanding, was believed to be showing signs of mental fatigue, he was taken to a therapy session. His plan was ultimately thwarted when XR managed to escape using XL's discarded body and then helped Buzz realize that he was the true XR, which led Buzz to return XR to his own body so that he could disable the bomb.
Some time later, XL formed an alliance with NOS-4-A2, the two of them infiltrating Star Command and capturing Ty Parsec in order to turn him into Wirewolf. The first stage of their plan complete, the trio traveled to Planet Z, where they succeeded in ousting Zurg and taking over. However, XL began to get an inkling of his lesser role in the alliance, as NOS-4-A2 was quick to claim dominion over Zurg's fortress. XL then fulfilled his primary task, creating a machine that would spread Ty's affliction to other organic beings, providing NOS-4-A2 with a virtually unlimited food supply. Sensing his increasing lack of use to NOS-4-A2 as anything but another meal, XL volunteered to hunt down Buzz and XR, who managed to help him see the error of his ways. Returning to his original purpose, XL helped defeat NOS-4-A2 and undo their evil plans. Subsequently, his head was attached to a copying machine and he joined the Star Command staff.
Unpredictable, XL can shift from being very nasty and cruel to acting fairly childish.
He also can't seem to understand literary sayings, as in the case of "Revenge of the Monsters".
When XL was a villain, he had a series of weapons and equipment at hand due to his mismatched parts. Most were secured in his two arms, both of which were different and were used for different tasks, as well as his chassis.
Stolen from one of the latest warbots, XL's chassis had the ability to deflect the Rangers' laser attacks due to its armarillium plating. It contained a rocket in the back compartment that allowed XL to fly and stored nets that he used for capturing.
XL's left arm was stolen from a research facility originally used for conducting experiments on objects and performing delicate work. However, XL used it to spew corrosive acid that could easily eat through metal, and because of its ability to extend, XL would use it to grab objects from a long distance.
XL's right arm was probably the most complex and diverse of all his attachments, modified to suit his needs as an arsenal of weapons. It could morph into three guns, each with a different set of abilities. The first gun could shoot bolts of plasma; the second, appearing almost like a machine gun, fired off laser blasts; the third, the largest of the three, looked like a cannon that shot the largest and deadliest plasma bolts.
Besides morphing into guns, his arm could also morph into a sawblade, a drill, a studded mace, an egg-beater, a sledgehammer, and a strange sort of drill with metal clampings around it that XR once called a "drill with teeth". His arm could also spark with electricity and send electrical currents at people to stun them.
Last, but not least, XL's right arm had a compartment similar to his chassis where he stored nets, and a special modded compartment with three distinctly-labeled buttons: blaster, acid and escape from prison. (Ironically, only his left arm could shoot acid and when the last button was once activated by XR during the events of "Head Case", it activated his left arm to shoot acid at the bars and escape.)
- "See, this was an 'okay' arm (he tears off his old right arm and replaces it with the new one) But...(laughs) I want better than okay. I want something distinctive!"
- "I beg to differ, Ranger! You've told me exactly what I need to know."
- "Flaws? What flaws? Do you see any flaws?!"
- "What is it with these people?!"
- "Hey! What does he have that I don't? I need to know!"
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- Just as XR's name stands for something, so does XL's. XL's name is a pun on extra large, which suited his large, mismatched body as a villain.
- Like Frankenstein's monster, XL had screws placed around his head.
- Revenge of the Monsters took advantage of XL's Frankenstein's monster appearance, teaming him with the vampire-esque NOS-4-A2 and the werewolf-based Wirewolf.
- The Return of XL
- A Zoo Out There (no lines)
- Bunzel Fever
- Head Case
- Revenge of the Monsters
- War and Peace and War (montage, no lines)