To Switch a Witch is the fourth episode of the third season of Scooby-Doo, Where Are You!, and the twenty-ninth episode overall in the series. It was later repackaged as the fourth episode of the third season of The Scooby-Doo Show, and the twenty-eighth episode overall in the series.
It is Halloween in Salem. An old caretaker is digging graves in a cemetery. Suddenly, a glowing witch appears, clad in a purple robe and green wig. The caretaker runs off screaming she's back. He arrives at the house of Squire Marley (one of the town leaders), claiming the old witch of Salem, Milissa Wilcox, has risen from her grave to seek revenge after being burned at the stake over 200 years ago.
The gang is on their way to Salem to see an old friend, Arlene Wilcox, who has just inherited her family's house. When they arrive, they see Squire Marley nailing the witch's sign to one of the trees. He warns them to leave, saying that Arlene has been possessed by the witch of Salem. The gang ingores his warnings and goes inside Arlene's house to find out what is going on. She tells them that Squire Marley saw the witch and claimed she looked exactly like Arlene, knowing that Arlene is a direct descendent of Milissa Wilcox. After being shown their rooms, Shaggy and Scooby dress in their Halloween costumes. Shaggy is a peasant, and Scooby is dressed like a witch, looking very similiar to Milissa Wilcox. It is there that they first encounter the witch, who appears in their room. Before they can call for help, the witch disappears in a cloud of green smoke.
Fred, Daphne, Velma, and Arlene rush upstairs to find a terrified Shaggy and Scooby. Daphne notices a strange liquid on the ground that is eating away the carpet. As they look out the window, they see the witch running back to the graveyard. They pursue her, leaving Arlene alone at the house. The gang arrives at the graveyard just to see the witch run to her grave and disappear in another cloud of smoke. Velma goes behind the grave and finds a hot piece of wire, a clue to the mystery. After being warned again, this time by Gar Mooney, the caretaker, they gang heads to the Salem Witchcraft Museum to look through old records. There they find the Wilcox family tree, where Arlene's name is marked out and replaced by the word "Gemini" (another clue). The gang split up, with Fred, Daphne, and Velma going back to Arlene's house, and Shaggy and Scooby trick-or-treating.
While they are trick-or-treating, Scooby is mistaken for Milissa Wilcox, and taken by Squire Marley and the town mob back to the witchcraft museum for an old fashioned confession (by repeatingly dunking him under water). Fred, Daphne, and Velma find the Wilcox house deserted and head to the graveyard, where they find Arlene. Arlene had escaped the mob after being warned by Gar Mooney. Shaggy then arrives after escaping the confession unseen, and the gang heads to the museum to rescue Scooby. They are successful, until the mob begins chasing them. The gang goes back to the graveyard to dig a hole to trap the witch in. Shaggy and Scooby foil the plan, but the witch falls into another hole, trapping herself. Squire Marley arrives just as the gang reveals what has been happening. The witch is actually Arlene's twin sister, whom Arlene had never met or known about. She was trying to scare Arlene out of town in order to steal her inheritance and estate. Fred reveals that Gar Mooney was also assisting her sister. The wire Velma found behind the grave was built by Mooney to make the witch glow. Also the acid on the carpet in Arlene's house came from the battery built from the wiring.
Marley apologizes to Arlene and escorts the unnamed Wilcox and Gar to jail.
Later at Arlene's place, Shaggy gives Scooby some chicken soup because he caught a cold from being dunked so many times, only with the chicken still left in.
Monsters and other villains:
- Ghost Witch of Old Salem (single appearance)(disguise)/
- Arlene Wilcox's sister (single appearance)
- Gar Mooney (single appearance)
- Milissa Wilcox (portrait)
- Chicken (single appearance)(no lines)
Food and drinks:
|Arlene Wilcox||She looks like the witch.|
|Squire Marley||Grumpy. He warned the gang to leave.|
|Gar Mooney||Strange manner. He also warned the gang to leave.|
| Arlene Wilcox's twin sister as the Ghost Witch of Old Salem|
|To frame Arlene and get the family inheritance.|
|Casey Kasem||Shaggy Rogers|
|Frank Welker||Fred Jones|
|Heather North||Daphne Blake|
|Patricia Stevens||Velma Dinkley|
|Janet Waldo|| Arlene Wilcox|
Ghost Witch of Old Salem (Arlene Wilcox's twin sister)
- It is presumed that the year takes place in 1978.
- In the live-action theatrical film, Scooby-Doo 2: Monsters Unleashed, the witch costume (an actual costume) is on display at the Coolsonian Criminology Museum.
Animation mistakes and/or technical glitches
- At the very beginning of the episode, the entrance gate to the cemetery is spelled correctly. However, later in the episode, when the Scooby-Doo gang is driving towards and underneath it, the spelling changes to "cemetary".
Inconsistencies/continuity errors and/or goofs/oddities
- What century were the townspeople living in? Their behavior, speech, and mannerisms were greatly exaggerated to resemble real Puritans from the 1600s.
- The Salem (Salem Village) where many of the supposed witches tried in the infamous 1692 trials came from, renamed itself to Danvers in 1752.
- When the Gemnii clue is discussed an inkblot is mentioned, but there is no indication to the viewer as to what this means.
- The Ghost Witch of Old Salem is a rare case (no pun intended), as the culprit's name and true self isn't revealed. It's also unknown if she was actually wearing a mask or make-up.
- Arlene apparently never knew her sister despite the fact the two were twins. This should be very impossible as there was no way Arlene could not have seen her sister during their youth. However it could be implied Arlene's sister was put up for adoption or placed in foster care which would likely be the reason Arlene never knew her. However it can be also argued that Arlene never had a twin and that her 'twin' only pretended to be her long-lost sister and even use make up to mimic her appearance and that she wrote 'Gemini' on the family records.
- Scooby-Doo, Where Are You!: The Complete Third Season DVD set released by Warner Home Video on April 10, 2007.
- Scooby-Doo, Where Are You!: The Complete Series (limited edition) DVD set released by Warner Home Video on November 9, 2010.
- Scooby-Doo, Where Are You!: The Complete Series DVD set released by Warner Home Video on November 21, 2011.
- Scooby-Doo, Where Are You!: The Complete Series DVD set released by Warner Home Video on November 13, 2012.
- Scooby-Doo! 13 Spooky Tales Around the World DVD set released by Warner Home Video on May 15, 2012.
- Scooby-Doo! Frankencreepy DVD released by Warner Home Video on August 19, 2014.
- Scooby-Doo! Frankencreepy Blu-ray Disc released by Warner Home Video on August 19, 2014.
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