Kathryn Felicia Day is an American actress, known for her work as "Vi" on the TV series Buffy the Vampire Slayer and for parts in movies such as Bring It On Again and June, as well as the Internet musical, Dr. Horrible's Sing-Along Blog. Day is also the star, script writer and producer of the original web series The Guild, a show loosely based on her life as a gamer, which is directed by Sean Michael Becker. She is a member of the Board of Directors of the International Academy of Web Television.

Tim Travers & the Time Travelers Paradox
Delilah
2025

The Ugly Chickens
Paula
2024

1982: Greatest Geek Year Ever!
Self
2022

The Candlenights 2020 Special
Self
2020

Pooka Lives!
Molly
2020

Chasing Molly
Kaitlin
2019

Stuck
Robin
2018

We Brought Back MST3K
Self
2018

We Love You, Sally Carmichael!
Sarah
2017

We Bare Bears
Karla (voice) · (1 episode)
2015

Lust for Love
Mary
2014
8-bit Haunted Dance Party
2014

How Videogames Changed the World
Self
2013

Rock Jocks
Alison
2012

Good Mythical Morning
Self · (1 episode)
2012

Chronicles of Humanity: Descent
Amanda Wood (voice)
2011

Red: Werewolf Hunter
Virginia Sullivan
2010

Three Rivers
(1 episode)
2009

Roommates
Alyssa · (13 episodes)
2009

Dr. Horrible's Sing-Along Blog
Penny
2008

Commentary! The Musical
2008

Dr. Horrible's Sing-Along Blog
Penny · (3 episodes)
2008

Dear Me
Pipsy
2008

Prairie Fever
Blue
2008

The Making of Dr. Horrible's Sing-Along Blog
Self
2007

The Guild
Codex · (70 episodes)
2007

Windfall
(1 episode)
2006

God's Waiting List
Trixie
2006
Love, Inc.
(1 episode)
2005

Supernatural
Charlie Bradbury · (12 episodes)
2005

Mystery Woman: Vision of a Murder
Emily Claire
2005

June
June Marie Jacobs
2004

Bring It On Again
Penelope
2004
Backslide
Maddie

Rhett & Link's Wonderhole
Draven the Technonaut (voice) · (1 episode)
2024

Adventure Time: Fionna & Cake
Betty (voice) · (3 episodes)
2023

Greatest Geek Year Ever! 1982
Self - Guest · (4 episodes)
2023

Monster High
Ghoulia Yelps (voice) · (10 episodes)
2022

Mystery Science Theater 3000
Kinga Forrester · (13 episodes)
2022

The Legend of Vox Machina
Captain / Bandit 2 (voice) · (2 episodes)
2022

The Rookie
Dr. Morgan · (2 episodes)
2018

Nailed It!
Self - Judge · (1 episode)
2018

Marvel's Spider-Man
Mary Jane (voice) · (1 episode)
2017

Danger & Eggs
Francesca (voice) · (1 episode)
2017

Mystery Science Theater 3000
Kinga Forrester · (20 episodes)
2017

The Magicians
Poppy · (4 episodes)
2015

Con Man
Karen · (5 episodes)
2015

Critical Role
Lyra · (2 episodes)
2015

Kittens in a Cage
Young Josephine · (1 episode)
2015

The Librarians
Charlotte · (1 episode)
2014

The Wil Wheaton Project
Self · (1 episode)
2014

Outlands
84 (voice) · (7 episodes)
2013

My Gimpy Life
Felicia · (3 episodes)
2012

The High Fructose Adventures of Annoying Orange
Peach / Ginger (voice) · (60 episodes)
2012

MyMusic
Gorgol · (1 episode)
2012

The Flog
Self · (55 episodes)
2012

TableTop
Self - Guest · (10 episodes)
2012

Dragon Age: Redemption
Tallis · (6 episodes)
2011

The Jeff Lewis 5 Minute Comedy Hour
Office Worker · (19 episodes)
2010

My Little Pony: Friendship Is Magic
Pear Butter (voice) · (1 episode)
2010

Fish Hooks
Angela (voice) · (3 episodes)
2010

The Webventures of Justin and Alden
Self · (2 episodes)
2010

Generator Rex
(1 episode)
2010

Adventure Time
Betty (voice) · (2 episodes)
2010

Dollhouse
Mag · (1 episode)
2009

The Legend of Neil
Fairy · (20 episodes)
2008

Eureka
Holly Marten · (18 episodes)
2006

Warm Springs
Eloise Hutchinson
2005

House
Apple · (1 episode)
2004

Century City
Sheryl · (9 episodes)
2004

They Shoot Divas, Don't They?
Call Girl
2002
For the People
Nicole · (18 episodes)
2002

Monk
Mrs. Heidi Gefsky · (1 episode)
2002

Emeril
(1 episode)
2001

One on One
Sarah · (1 episode)
2001

Strong Medicine
Jesse's Friend · (2 episodes)
2000

Buffy the Vampire Slayer
Vi · (8 episodes)
1997

Mystery Science Theater 3000
Kinga Forrester · (0 episode)
1989