|Dates|| ???? - 1978 (suicide)|
1978 - 2016 (spirit laid to rest by Sam Winchester)
|Location||St. Paul, Minnesota|
|Episode(s)||12.03 The Foundry|
Hugo was a loving family man with a daughter named Elizabeth until 1978 when his daughter was killed in a hit and run accident. The loss of Hugo's daughter drove him insane and he bricked himself behind a wall in his basement and starved to death.
Following Hugo's death, he became a vengeful spirit trapped in the house he had once lived in. As families moved in with children, Hugo coveted the children in his maddened state and murdered them, binding their spirits to his which gave him great power. Hugo committed these murders in 1985, 1989, 1991 and 2004. Amongst those killed was Lucas Kellinger.
In 2016, a couple was drawn into the abandoned home where Hugo and his trapped souls resided. Hugo murdered both adults, freezing their hearts solid. The deaths drew the attention of hunter Mary Winchester who investigated with the help of her sons Sam and Dean. After encountering the spirit of Lucas, the younger Winchesters believed themselves to be dealing with mylings, the vengeful spirits of children from Scandinavian lore, but Mary recognized that Lucas wasn't trying to hurt her and contacted his mother to learn of how he died, learning that he had died in the same manner as the couple Hugo had murdered.
Upon Mary's return to the house, she was led to the wall Hugo's body was hidden behind by Lucas but was confronted by Hugo who possessed her and used her to attack her sons. Before Hugo could kill Dean, Mary started struggling for control with him, regaining enough control to direct Sam to the basement. As Lucas directed Sam to the wall behind which Hugo's remains were located, Hugo regained full control over Mary and disarmed Dean, but turned his attention to the basement after hearing Sam start to knock down the wall behind which he was hidden. Taking advantage of the moment, Dean uses an iron chain to bind Hugo as Sam salts and burns his body. Hugo is expelled from Mary and as he goes up in flames, the souls of the children he trapped appear around him. With a scream, Hugo's ghost disappears in a blast of flame and the children are released, allowing their souls to finally move on to Heaven.
After returning to the Bunker, Mary explains to her sons that when Hugo possessed her, she saw and felt what had driven him to do what he had done and explains his motives to them.