Halloween is episode 21 of Season 3.
- Jerry Lewis
- Evil Ghost
- Chuck Vanderfleet
Clover is forced into babysitting Chucky, the obnoxious son of her mother's best friend, on Halloween night, but luckily she is able to rope Sam and Alex into hanging out with her so it will not be such a drag. The girls take Chucky trick-or-treating in the eerie gated community he lives in, but none of the neighbors seem to be home. They find out that the neighborhood is associated with a curse, which manifests itself after Mandy summons a spirit. The inhabitants are turned into ghouls bent on destroying the spies. Clover unwillingly becomes a hideous ghoul, undergoing another painful transformation, and Mandy becomes the ghost's queen! Can Sam and Alex survive the zombie attack and turn things back to normal before Chucky's mother gets home? In a b-story Jerry is going to his first ever Halloween party and seeks the girls' advice on costumes.
- References to the rank of queen in “Totally Spies!”
- “Beauty Is Skin Deep” -- Vanity is an ex-beauty queen.
- “Creepy Crawly Much?” -- Alexandra is selected to be the queen of Max Exterminus.
- “Green with N.V.” -- Natalie Valentine calls the 3 spies “16 year old popularity queens”.
- “Halloween” -- Mandy is selected to be the queen of the Evil Ghost.
- Ice Queen Perfume
- “Malled” -- Samantha refers to Mandy as a “beauty queen”.
- “Mime World (Jazz Hands Return - Part 3)” -- Samantha is selected to be the queen of Jazz Hands.
- “Queen for a Day” -- Tassara and the Beverly Hills High Homecoming Queen.
- “So Totally Versailles!” -- Mandy believes she is Marie Antoinette. She is selected to be the queen of Auguste.
- “Stuck in the Middle Ages with You” -- Clover is selected to be the queen of the Black Knight.
- “The Iceman Cometh” -- Clover is referred to as an ice queen by Daryl and Gelee.
- “WOOHP-Ahoy!” -- Clover is selected to be the pirate queen of Salty Schooner.
- The number 666 is the traditional number of evil.
- Alex makes a reference to the Terminator series.
- "Vista Verde" translates to "Green View".
- Clover does not wear her catsuit in this episode.
- While the Evil Ghost is the main antagonist of this episode, Mandy is particularly the one responsible for causing the events of this episode because of her summoning him by sudden matter.
- Clover's costume does not match her catsuit color. Her costume is blue, her catsuit is red.