The Mane-iac is a fictional character that appears in the fourth season of the show My Little Pony: Friendship is Magic and is the main antagonist of the episode entitled "Power Ponies".
In the beginning of the episode, Spike shows Twilight Sparkle a couple pages of a Power Ponies comic book on which the Mane-iac is depicted.
She is stated to be the Power Ponies' "most evil nemesis". Originally the power-mad owner of a hair-care product company, she was the victim in an accident at her shampoo factory and fell into a vat of green liquid and was electrocuted by a downed power line. The accident had given her strange new powers and caused her to go insane. Another page shows the Mane-iac breaking into the Maretropolis Museum and stealing something called the Electro-Orb.
When Spike and his friends are sucked into the comic book and become the Power Ponies, they're brought to the point in the story at which the Mane-iac has just stolen the Electro-Orb. She watches in amusement as they grow accustomed to their newfound superpowers before leaving the scene. When the Power Ponies track the Mane-iac down to her headquarters—her abandoned shampoo factory—she dispatches the ponies with her "Hairspray Ray of Doom", freezing the ponies in place and rendering their powers useless. She then takes the Power Ponies prisoner, but leaves Spike/Humdrum alone, considering him pointless. The Mane-iac uses the Electro-Orb to power her doomsday device, with which she plans to cause the manes of every pony in Maretropolis to grow wild. As she gloats to the Power Ponies over her apparent victory, Spike traps some of her henchponies and helps in freeing his friends. Just before the Mane-iac can use her weapon on Fluttershy/Saddle Rager, a firefly enters her line of fire, and she swats it away. This action incurs Saddle Rager's wrath, and she single-handedly does away with both the Mane-iac and her weapon.
As the result of being struck by her own weapon, the Mane-iac's mane grows out of control, ensnaring her in it like a straitjacket.
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