Drakken and Shego invade the lab of Cyrus Bortle (from [[Recap/KimPossibleS1E17TheTwinFactor "The Twin Factor"]]) to steal an "Electron Magneto Accelerator". They are interrupted by Team Possible, but manage to escape with the EMA. However, during the fight both Kim and Shego got [[EmotionBomb emotion-controlling "Moodulator" chips]] attached to them without anyone noticing. Also, Ron accidentally picks up the Moodulator control unit, mistaking it for the Kimmunicator.
After Kim notices that the device they have isn't the Kimmunicator, Ron mistakes it for a video game and starts playing with it. This causes both Kim and Shego to start [[MoodSwinger rapidly shifting moods]], from sadness to giddiness to rage. Ron and Drakken, having no idea what's going on, find themselves bearing the brunt of their odd behavior. [[HilarityEnsues The sitch escalates]] when the control unit gets set to "love", causing Kim and Shego to start aggressively pursuing their partners, much to their discomfort.
!!This episode provides examples of:
* EmotionBomb: The Moodulator chips and their control unit.
* IfYouEverDoAnythingToHurtHer: [[OverprotectiveDad Kim's dad]] [[TwerpSweating warns Ron]] that he'd better not make Kim unhappy unless he wants a one-way trip to a black hole. Considering Kim's dad is a rocket scientist, ''that is not an idle threat.''
* IKnowYoureInThereSomewhereFight: Ron tries to jog Kim's memory of "the good times" as she tries to hurt him.
* KissingUnderTheInfluence: The "lovestruck" Kim and Shego kiss Ron and Drakken while under the moodulator's influence.
* LittleBlackDress: Kim's outfit for her date with Ron. It makes [[JawDrop quite an impression]] on him.
* OffscreenTeleportation: When Kim is in "lovestruck" mode, she keeps popping up wherever Ron is in spite of his efforts to evade her.
* OhCrap: Drakken has a whiplash mood shift of his own when he goes from gloating about Kim being trapped in "an irreversible frenzy of rage" to realizing (when he hears that there were ''two'' Moodulator chips) that Shego is likewise frenzied with rage, directed at him.
* PhotoBoothMontage: Shego gets Drakken into a photo booth. The audience sees the resulting pictures, concluding with one of her [[TheGlomp pouncing on him]].
* PostKissCatatonia: Ron is in a daze after Kim (under Moodulator influence) kisses him.
* ShipSinking: Subverted. When the episode first aired, many were lead to believe that Kim and Ron would not have a romantic relationship...then along came ''[[WesternAnimation/KimPossibleMovieSoTheDrama So The Drama]]''.
* ShipTease: Both Kim/Ron (before they became an OfficialCouple in ''[[WesternAnimation/KimPossibleMovieSoTheDrama So the Drama]]'') and Drakken/Shego.
* ShoutOut: Angry!Kim tells Ron that he's "[[ILoveLucy got some splainin' to do]]!"
* StalkerWithACrush: Kim and Shego act like this toward Ron and Drakken, respectively, when the Moodulators get set to "love".
* TrickDialogue: After a montage scene of Ron expressing [[IDontWantToRuinOurFriendship his concerns]] about [[RelationshipUpgrade going from "friend" to "boyfriend"]], we find out that he's been talking to Mr. Barkin.
-->'''Barkin:''' Stoppable, how did you get in my house?!
* TroubledFetalPosition: Drakken curls up and sucks his thumb after dealing with Shego's MoodWhiplash, including rage.
-->'''Drakken''': Did I forget your birthday? Is that what this is about? Because...I'm scared.
* UnstoppableRage: Dr. Bortle calls it "irreversible frenzy of rage", but Rage!Kim and Shego spend several minutes relentlessly pursuing the terrified Ron and Drakken.
* WomanScorned: When the Moodulator control gets broken while set to "rage", Kim (who had gotten a LetsJustBeFriends talk from Ron) and Shego (who Drakken had abandoned in the middle of a crying jag to carry out his evil scheme) start taking out their anger on their respective male partners.