Bart lisa and maggie discovered hugo after they heard strange sounds coming from the attic and after homer spilled the beans about there.
Simpsons halloween twin living in the attic.
The next morning after they mention this to their parents marge reminds homer to feed the thing.
The kids spy on homer climbing to the attic feeding fish heads to something.
The thing and i bart discovers he has an evil twin who is living in the.
Bart stays behind as the others leave to search for hugo but bart realizes that hugo never left the house.
From season 8 episode 1 treehouse of horror vii a halloween special which is divided into three short stories.
Shortly after their birth they were separated by dr.
Hugo simpson is a non canon character and bart s conjoined twin in treehouse of horror vii.
He explains that bart has an evil twin named hugo.
The two were originally conjoined but were separated at birth.
In a parody of the hunchback of notre dame and basket case bart lisa and maggie begin to hear strange noises coming from the attic one night.