- "A long time ago on a very peculiar day, my mirror lured someone out of his bed...and opened a doorway to my workshop. I do not know if the mirror was being mischievous...or malicious...perhaps it knew that the curious intruder had a role to play in my...project" -Yen Sid
Yen Sid, (From the Fantasia segment "The Sorcerer's Aprentice") created a pen-and-paper world for Disney's forgotten characters, held in an intricate model on a table, and accessible through a mirror. Mickey Mouse spills paint thinner on the pen-and-paper world, thus ravaging the world and creating the Shadow Blot.
Many years ago Yen Sid created a world for all of Disney's forgotten, rejected, and retired creations. He crafted an imaginative world full of different wonders that would appeal to anyone who were to enter it. Yen Sid soon used paint to put the finishing touches on his world ("I was putting the finishing touches on my latest creation. A world for things that have been forgotten."). At the same time Mickey wandered into his workshop, and watched him finishing his creation. Afterwards, Yen Sid retired to his chambers ("Satisfied with my progress, I put the magic brush down and retired to my chambers"). Ignorant, of what Mickey was about to do to this new world ("Had I known what events would follow, I would have locked away everything; paint, brush and thinner"), by the time Yen Sid discovered the ruined world caused by Mickey, who created the Blot (he didn't know about Mickey's identity yet), it was too late... ("I heard the noises and rushed to see what had happened, but I was too late. The world I had created was ravaged, a wasteland... The mysterious intruder was gone. I did not learn his identity. Well, not for a very long time...") According to the graphic novel, the reason why Yen Sid didn't fix Wasteland was because he was waiting for Mickey to return to clean up after himself.
- "The curious intruder once again entered my workshop, with one goal in mind: to find and retrieve my Magic Brush"
- "Suddenly, the cosmos spread before him. A plane of imagination fueled by Brush, Paint and Thinner."
- "Finding himself at home, Mickey should have felt safe. Looking at the Brush, he wondered if he could find the truth behind his unease."
- "With the Magic Brush, what would Mickey do? Would he paint the world, or thin it to nothingness? The choice was his..."
In Epic Mickey
As Mickey successfully leaves Wasteland after defeating the Shadow Blot, Yen Sid was already there, grabbing Mickey as he comes back into the world ("The intruder returned to my land, but not in the way I expected."). Mickey nervously gave him back his brush, and Yen Sid commanded him to leave his workshop and back to his house ("After retrieving my brush, I peered down into the world I had created, and noticed something had changed. The wasteland no longer needed my magic. Thanks to the efforts of my apprentice, it had developed some magic of its own. Magic born of courage, and wise choices. And of course, the luck of a certain cartoon rabbit.") As Mickey returns to his house, Yen Sid uses the mirror to give Mickey one last look at Wasteland and see the consequences of his past actions while in there ("The funny thing about mirrors - our reflections taught us to reflect... on the struggles we have faced or avoided; how well we manage time; enemies defeated or redeemed; the ways in which we treat others; and perhaps most important, the friendships we nurtured or neglected."). He even allows Mickey one more conversation with Oswald, and even bond with him ("Oswald and Mickey are, in some ways, each a mirror for the other. Brave, resourceful, and good of heart. I hope they become friends. And perhaps more, perhaps... even... brothers...") After the credits, Mickey is shown still talking to Oswald and Ortensia via mirror. The image in the mirror changes to Yen Sid, who seals the mirror to his workshop, and supposedly the Wasteland, in order to ensure that Mickey would not cause any more mischief there ("And I have ensured Mickey will get into no more mischief in my workshop"). Yen Sid then states ("Then again, he IS Mickey Mouse.") as Mickey, unknown to Yen Sid, discovers that he still has some of the Blot absorbed in him, meaning that he has all the Blot's powers and can possibly enter the Wasteland against Yen Sid's will.
It has been confirmed that Yen Sid will reappear in the sequel. He will once again narrate, but will speak as if the events of the game took place in the past.
"Walt Disney's boundless imagination resulted in a creation whose potential even he didn't realize: Yen Sid, the formidable Wizard from Fantasia, who is basically Walt's alter ego. It was Yen Sid who crafted Wasteland as a home for Walt's forgotten creations, serving as a benevolent, albeit unseen creator, watching from "on high" and enjoying their antics.
Of course, he could not have forseen that history would eventually repeat itself as his former "sorcerer's apprentice", Mickey Mouse, would accidentally have an important role in the destiny of Wasteland..." ''( 'Yen Sid 's "Tales of Wasteland" profile)
Yen Sid is a character that makes a small appearence in the Epic Mickey: Tales of Wasteland (digi)comics. These comics are a prequel to Epic Mickey and take place before the Thinner Disaster. He appears in "There's a Hole in the Sky" where he spills some thinner on his model of Wasteland and creates a hole in the sky that Oswald tries to use to escape Wasteland. He corrects his mistake with paint when he discovers this.
- The observant reader will notice that "Yen Sid" is "Disney" spelled backwards, a mirror-reflection, if you will. Also, Yen Sid is the unnamed sorcerer in the film "Fantasia" was nicknamed "Yen Sid" by the studio animation department.
- The part where Mickey Mouse enters through the magic mirror to Yen Sid's workshop is based on the Mickey Mouse short: Thru The Mirror.
- Yen Sid can be regarded as somewhat a forgotten character himself, as he has not appeared in any other Disney media since Fantasia, apart from the Kingdom Hearts series.
- Yen Sid is the only character who has a spoken script in the first game. All other characters in it communicated through "bark-talk".