Dr. Hex

"The Mushroom Kingdom has grown soft. As long as Peach and her cronies are in charge, it shall never return to its former glory!"

- Dr. Hex, stating her intent to take over the Mushroom Kingdom

Dr. Hex (sometimes shortened as simply Hex) is a major antagonist in the TV show ''Mushroom Guard. ''Over the course of the series, she battles the titular group many times.

Physical Appearance
Dr. Hex is a Toad with green spots and white hair. She wears a black, floor-length cloak, and she has an eyepatch over her right eye.

Attacking the Mushroom Kingdom
Shortly before the Mushroom Kingdom is due to celebrate Peacekeeping Day, Dr. Hex mounts an attack on the Kingdom. The Mario Bros confront her, but she escapes. Mario and Luigi call up Daisy, Berry and Gold for backup. As they attempt to track down Dr. Hex, they are followed by Zac and Sarah, who surprise the Mario Bros by using their Turf War skills to capture Dr. Hex. While the newly-formed Mushroom Guard celebrates, Dr. Hex is hauled off to prison. However, in a later episode, she escapes, and continues to wreak havoc on the Mushroom Kingdom.

Teaming up with the Koopas
Eventually, Dr. Hex goes to Bowser's Castle for help. She starts to work with Bowser and the Koopa Troop, but she continues to work on her own plans as well.

At one point, she successfully infiltrates Peach's Castle, but she is then overthrown by Zac.

Personality and traits
Dr. Hex believes that the Mushroom Kingdom has "grown soft," and seeks to take over the Kingdom due to this. She is reckless and cunning, only ever thinking about her own goal of ruling the Kingdom.

Dr. Hex believes that Inklings are a weak species, and as a result, she is surprised when Zac and Sarah are able to foil her schemes.

Hex is an adept magic user: unlike Kamek and the Koopalings, she is able to cast spells without the help of a wand.

Allies
At first, Dr. Hex doesn't think much of Bowser and the Koopa Troop. However, she teams up with them after she sees how strong they are.

Enemies
Dr. Hex is a major enemy of Mario and the Mushroom Guard. In particular, she sees Zac and Sarah as a nuisance, and wishes for them to be banished from the Mushroom Kingdom.

Trivia

 * Dr. Hex's name is a reference to her magical abilities: a hex is a term for a magical curse.
 * Dr. Hex can be considered as a counterpart to Kaos from Skylanders Academy: both characters have similar outfits and abilities.
 * An episode reveals that Dr. Hex is able to see with both eyes, and the eyepatch is only cosmetic.
 * From the same episode onwards, whenever Hex casts a particularly powerful spell, the eyepatch flips up and both her eyes glow white.