A rash of stolen technology leads Team Lightyear to discover that XL, the proto-version of XR, has been fixed up by Zurg and sent out to soup himself up and wreak revenge upon Star Command. When Buzz attempts to lure XL into a trap by using XR as bait, Commander Nebula ends up kidnapped, instead.

XL has found that the primary difference between he and XR is that XR has a component called an AFD, so he kidnaps XR and removes his AFD.

Team Lightyear receives a call from Jo-Ad while in the early phase of an investigative mission (involving a series of thefts); Booster's family is letting Booster know that the bunzel harvest (the primary crop on Jo-Ad, which resembles eggplant) is due. When Booster claims that his duty to the Space Rangers supersedes his farming history, his Grandfather reminds him of the legendary ""Bunzel Fever"", that strikes down any native of Jo-Ad that isn't involved in the bunzel harvest. Booster dismisses the legend and eschews the harvest. When it turns out that the legend isn't a myth, Booster goes through a ""pon-far""-type thing, that is marked by him ""hulking out"" into a large, bellicose form that is determined to harvest bunzels, or anything bunzel-esque (...and since this transformation is also marked by him having spells of mistaking anything roughly ovoid for a bunzel, this gets fairly hazardous for anyone who is rotund and/or in a space ranger suit, XR, and Team Lightyear's ship

Answering a distress call, Team Lightyear discovers a ship under attack by Vulturans (a vaguely bird-like race, that XR recognizes as a race that tends to have a thing against robots). Team Lightyear fights them off...but in the battle, XR flies into a mad rage (gets a little ""blowie-uppy"") and ends up being seriously disassembled. When the LGMs fix him up, they discover signs of metal fatigue. Their report is sent to Commander Nebula, who accidentally spills coffee on the report, smudging the lettering and making it look like ""mental fatigue"". XR is sent off to the resort world of Mahamba 6 for a weekend pass, before having to take a psychiatric evaluation from Star Command's resident psychiatrist, Dr. Animus (...who resembles a native of Binpinardia...). While on Mahamba 6, XR is picked up by a taxi driver who turns out to be XL (...he sent XR a fake ""you have just won a free vacation!!""-flier to XR to lure him in...). XL kidnaps XR and steals his body.

After being bitten by NOS-4-A2 on the mysterious planet of Canis Lupus, Ranger Ty Parsec is transformed into a Wirewolf (...imagine a form of lycanthropy blended with either Star Trek's Borg techno-virus, or with Transformers' Key to Vector Sigma...) [this whole bit is shown in summary, as if it were reminding us of an earlier episode...except there IS no earlier episode about this as far as I can tell]. Even though the transformation only takes place when on or near Canis Lupus, Commander Nebula decides to boot Parsec from the Space Rangers for his own, and everyone else's, good. While this meeting is wrapping up, NOS-4-A2 and XL show up. They have a chunk of Canis Lupus, that causes Parsec to re-transform into a Wirewolf, and they kidnap the en-cursed Parsec. [...the ""Monster""-bit in the title refers to how Parsec is pretty much a robotic werewolf, XL is pretty much a robotic Frankenstein's monster, and NOS-4-A2 is a robotic vampire...] With Parsec