"But when I looked over his shoulder I saw a terrifying witch abducting [Peppa's little brother] George.
"The whole video was vile."
The Sun on Sunday found it took a three-year-old just minutes to find the clips on a computer where the settings were tuned to preschool suitable content.
The child found scores of mock videos featuring Peppa Pig as well as other children's characters, many of which have been watched more than three million times.
YouTube Kids was set up to protect children from inappropriate web content while allowing them to watch suitable content safely.
YouTube have removed the clips and advised that any content that doesn't belong in the app is removed within hours.
Peppa Pig's spider web episode
Last year an episode of Peppa Pig where she befriends a spider was banned in Australia.
After a single complaint, the episode was deemed unsuitable for fear of children getting the wrong idea about touching spiders.
