|Henrietta Von Marzipan|
|Nicknames||"Heiny", so called by Numbuh 5.|
|Voiced by||Dee Bradley Baker (male), Candi Milo (female)|
Henrietta von Marzipan is Numbuh 5's personal arch-rival in candy hunting. Five years ago, due to cursed caramels in Guatemala, she lost her beauty and her femininity, and was since known as Heinrich von Marzipan.
Henrietta and Abigail have known each other for many years and share a storied and largely unexplained history. The two apparently became enemies after a mysterious incident in Guatemala five years prior that culminated in her being caught red-handed with a bag of stolen candies and being grounded for a month.
Henrietta, as her male form Heinrich, first appears in Operation: J.E.W.E.L.S., where he opens the hidden tomb of "King Two-Tons-of-Candy" with a Blurpleberry Jewel stolen from Numbuh 5, and upon doing so turns into a giant candy monster. Due to not sharing any of the candy, however, it tastes like asparagus, and he tries to destroy Abigail for "sabotaging" the candy and "tricking" him. Heinrich is returned to normal, albeit with a stomach ache, when Numbuh Five reclaims the candy jewel.
In Operation: R.A.B.B.I.T., Heinrich finds a volcano containing chocolate lava that turns anything that touches it to chocolate in the jungle within the jungle gym at Gallagher Elementary School. He steals the first grade's pet rabbit, intending to turn it into a real chocolate bunny. Heinrich is thwarted by Numbuh 5 and Numbuh 2, as well as a girl by the name of Jessica, and ends up falling into the crater of the volcano to die. At the end of the episode, however, he is seen emerging from the volcano as a chocolate monster.
Heinrich returns in Operation: C.H.O.C.O.L.A.T.E., which directly continues this storyline, to enact his revenge on Numbuh 5. Everything he touched was turned into chocolate as well, which initially worked out well for him. After a time, however, Heinrich grew tired of chocolate and began craving a cheeseburger. When he tried to eat one, it turned into chocolate, and he soon realized that he could not eat anything but chocolate and falls into despair because of his "Midas Touch" and vows for vengeance against Numbuh 5 by attacking her family and teammates in the time searching for her. Heinrich is defeated through Abigail's clever use of intense sunlight to turn him into fondue and then using "Marsmallows", marshmallows found on Mars, to completely liquefy the crazed candy hunter. Afterwards, his chocolate remains are taken to the KND Arctic Prison, where the Kids Next Door scientists resurrect him and remove his chocolate-based powers for good. While incarcerated, Heinrich receives a package from Numbuh 5 containing a cheeseburger, which is what he desired after all his time under the curse, and was brought nearly to tears as he began to eat it. Unfortunately, it had pickles on it, which he openly stated that he hates above all else.
In Operation: L.I.C.O.R.I.C.E., Heinrich had been kidnapped from prison by Black John Licorice and his band of evil Licorice Pirates, who need a candy seed that Heinrich selfishly ate while he was traveling with Stickybeard as his cabin boy a while ago; the Pirates needing the seed in order to break a licorice-based curse that was bestowed on them for cutting down licorice trees. Numbuh 5 joins forces with Stickybeard and his Candy Pirates in order to track down Black John and rescue Heinrich. Together, Stickybeard and Abby succeed, and Heinrich is once again sent to Arctic Prison by Abigail.
In Operation: C.A.R.A.M.E.L., Heinrich's final appearance, the incident in Guatemala 5 years ago is explained. In order to create pieces of ancient golden caramel, a magic ritual was performed that took away the most valued quality of the human in question and turned their most prized quality into five pieces of delicious caramel with flavor depending on the quality taken. Henrietta fell victim to the ritual which transformed her into Heinrich, but before the curse could be reversed, she selfishly ate all of her caramels, causing her to lose the quality she valued the most. Knowing that Henrietta could not control her greed, Abigail left her behind, and Henrietta blamed her for becoming cursed.
Five years later, Heinrich tricks Abigail into a truce and uses the ritual to connect all the KND within half the continent of Central America and performs the same ritual using the massive amounts of candy contained inside them, affecting all the operatives in the treehouses. Heinrich taunts the now nerdy and pathetic Numbuh 5 while eating all her caramels, but before he eats her last one Numbuh 5 reveals that she has been keeping Heinrich's last piece of caramel from five years ago so she could learn to share and finally break the curse. In a fit of blind fury Heinrich pushes her aside and takes the caramel, and tries to eat it for good, Abigail reminds him of how they used to be and how much she cares about him. Thus, Heinrich is driven to tears and gives her back the caramel, thus breaking his 5-year long curse and returning to normal again.
Everyone affected by the ritual is also returned to normal, and it is revealed that he is really a beautiful young girl named Henrietta Von Marzipan who is Abigail's best friend and former candy hunting partner. Their friendship is restored and they bid each other farewell, but the other members of Sector V are understandably confused by this revelation, but Numbuh 4 remains oblivious until Numbuh 1 explains.
As Heinrich, Henrietta was bitter, prideful, arrogant, overconfident, selfish and greedy, all stereotypical characteristics of rival treasure hunters. She held a deep animosity towards Numbuh 5, due to the latter's "betrayal" in Guatemala. Unlike Numbuh 5, she had no respect or regard for ancient superstition or curses, such as when she brushed off the warning in the tomb of King Two-Tons-of-Candy, or kidnapped the first grade class' pet rabbit to make an actual chocolate bunny, not knowing its absence would devastate the entire classroom. This disregard, coupled with her arrogant nature and resentment of Numbuh 5 would repeatedly prove to be her undoing. Once free of the curse, however, Henrietta reverted to her original personality of a sweet, compassionate girl, having rediscovered the value of sharing with the help of her former friend.
Henrietta is a slim girl with light-blonde hair in pigtails, tied with red braids, and bright blue eyes, with a monocle over her left eye. She wears a brown, round explorer's hat and light-brown button-up shirt with a dark-brown vest over it, a red neckerchief, and large brown gloves. She wears dark-green pants tied with a belt and huge brown boots.
When in the form of Heinrich, she is much chubbier, and her nose sticks up enough to see the nostrils.
- His motif and many of the episodes he appears in as Heinrich are spoofs of adventure movie villains such as in Indiana Jones and The Mummy, specifically René Belloq.
- Marzipan is a type of European candy that is made up of ground almonds and sugar.
- Henrietta's prized quality is not stated, though it is generally believed to be her beauty, or her femininity.
- To his/her chagrin, Numbuh 5 often refers to Heinrich by the nickname Heiny.
- Henrietta was the second villain to have melted under a source of heat while being made of chocolate, the first being Ice Cream Monster.
- Heinrich is voiced by Dee Bradley Baker, and Henrietta is voiced by Candi Milo. These two voice Dad and Mom from Cow and Chicken, respectively.