- "Hey, moron! I'm invisible! How are you gonna fight someone you can't see?"
Becoming InvisibleMarcie was a student at Sunnydale High School. She was not popular, had no friends and was completely ignored, even by the teachers. On her yearbook the only thing people signed was "Have a nice summer" which was used when they had nothing to say. Even unpopular students like Willow Rosenberg and Xander Harris wrote this and didn't seem to know her even though they had shared four classes in the ninth grade. Marcie's only real activity was to play the flute.
After a while, Marcie became invisible during one of Ms. Miller's classes when she raised her hand up to provide answers but was not noticed. Rupert Giles theorized that it was the result of the Hellmouth manipulating reality on the quantum level. Since people essentially perceived Marcie as being invisible, she literally became that way. After this, Marcie then took shelter above the school's ceiling.
"Haunting" Sunnydale High
Six months after becoming invisible, Marcie started using this new "power" to assault the popular students and teachers in retribution for her being ignored, due to her being driven insane by her loneliness and exile from everyone else. She first beat Mitch Fargo with a baseball bat in the boy's locker room, leaving the word "LOOK". She pushed Harmony Kendall down a staircase and tried to kill Ms. Miller by suffocating her with a plastic bag, leaving the word "LISTEN" written on the chalkboard. It then became clear that her main target was Cordelia Chase, the most popular girl in school.
The Slayer, Buffy Summers, found out what had happened to Marcie and tried to help Cordelia when she discovered the connection between her and the other victims, and though she felt sympathy for Marcie because of what she endured, she nonetheless decided that she couldn't let it continue. They tried to trap Marcie by using Cordelia as bait, but Marcie managed to capture her and knock out Buffy with a hypodermic needle.
She also tried to kill Giles, Xander and Willow by locking them in the boiler room and flooding it with gas. However, Angel rescued the group because of his lack of a need to breathe (being a vampire).
Marcie took Cordelia and Buffy to the Bronze, tying them to chairs with the word "LEARN" placed decoratively on the curtain with sparkles. Marcie planned on giving Cordelia a "make-over" by mutilating her face. Buffy managed to free herself, but found it difficult to fight Marcie when she couldn't see her. Buffy used her Slayer senses to detect the sound of Marcie's movements, and landed a perfect punch, flying Marcie into the curtain which fell on her, rendering her visible.
Marcie was then taken away by federal agents Doyle and Manetti, who took her to a classroom full of invisible students like herself. As she arrived, the teacher instructed her to turn to page 54 of a textbook to a chapter titled "Assassination and Infiltration." Looking at the page, Marcie remarked "cool".
Behind the scenes
- She was portrayed by Clea DuVall.
- In 2004, Clea DuVall starred in the horror film The Grudge alongside Sarah Michelle Gellar.
- Dark Horse editor Scott Allie was surprised at the popularity of the one-shot character when several fans wrote to his letter column, requesting her inclusion in Buffy the Vampire Slayer Season Eight.
- With the End of Magic, it is unknown if Marcie and her companions retained their invisibility; it is somewhat likely that they lost it (thus causing Marcie to become visible again).
- Clea DuVall says of her role, "It was pretty early in my career. I’m almost positive we shot it before it had aired. Or maybe I just didn’t know they were doing that show, and when my agent told me I had an audition for it, I was like, “They’re making a TV show of Buffy The Vampire Slayer? That’s insane.” Then I went on to also become obsessed with the show, because it’s so good. But I was pretty new, and I was really young. I think I was maybe 18 or 19 when we shot it. I was nervous and very shy, but really related to that character so much because I am a shy person. I am an introvert. I was so taken with the sensitivity and the emotion in that role. When I first heard the idea they were making a show about Buffy The Vampire Slayer, I thought it was insane and then read that script and was impressed, and it’s something I’m happy I was a part of."
- The character was named after Gail Berman's production assistant Marcy Ross. "Marcy and I are probably the only ones who would say that's our favorite episode, but there's a real reason for it." 
- "Out of Mind, Out of Sight"
- "Gone" (Only mentioned)
- "Lessons" (Only mentioned)
- "Storyteller" (Only mentioned)