| Year | Title | Role | نوت |
|---|
| 1985 | Twilight Zone, TheThe Twilight Zone | Nola (age 10) | Episode: "Her Pilgrim Soul" |
| 1987 | The Twilight Zone | Deidre Dobbs | Episode: "Shelter Skelter" |
| 1988–1993 | Wonder Years, TheThe Wonder Years | Winnie Cooper | Main role |
| 1989 | Super Mario Bros. Super Show!, TheThe Super Mario Bros. Super Show! | Patty | Episode: "Day of the Orphan" / "King Mario of Cramalot" |
| 1990 | Camp Cucamonga | Lindsey Scott | Television film (NBC) |
| 1992 | Captain Planet and the Planeteers | Lisa | Voice role; episode: "A Formula for Hate" |
| 1994 | Babylon 5 | Aria Tensus | Episode: "The War Prayer" |
| Moment of Truth: Cradle of Conspiracy | Kristin Guthrie | Television film (NBC) |
| Walker, Texas Ranger | Laurie Maston | Episode: "Stolen Lullaby" |
| Sirens | Alison Trent | Episode: "Victims" |
| 1996 | Justice for Annie: A Moment of Truth Movie | Annie Mills Carman | Television film (NBC) |
| 1998 | Love Boat: The Next Wave | Mary Dutton | Episode: "How Long Has This Been Going On?" |
| Working | Jolie | Episodes: "As Bad As It Gets", "She Loves Me Yeah, Yeah, Yeah" |
| 1999 | Random Play | Daughter | Episode: "1.4" |
| 2000–2004 | Static Shock | Freida Goren | Voice role; recurring role |
| 2001 | Division, TheThe Division | Wendy | Episode: "Don't Ask" |
| Even Stevens | Sandrine | Episode: "Sibling Rivalry" |
| 2002 | Justice League | Sapphire Stagg | Voice role; episode: "Metamorphosis" (parts 1 & 2) |
| 2002–2003 | West Wing, TheThe West Wing | Elsie Snuffin | Recurring role |
| 2004 | King of the Hill | Sharona / Misty | Voice role; episodes: "My Hair Lady", "Cheer Factor" |
| Game Over | Elsa / Renee | Recurring role |
| Century City | Sally | Episode: "Without a Tracer" |
| Eve | Claudia | Episode: "Friend or Foe?" |
| 2005 | NCIS | Erin Kendall | Episode: "Witness" |
| Jack & Bobby | Keirsten | Episode: "And Justice for All" |
| NYPD Blue | Rosemary | Episode: "Moving Day" |
| Strong Medicine | Natalie Pascal | Episode: "Feeling No Pain" |
| Path of Destruction | Katherine Stern | Television film (Syfy) |
| How I Met Your Mother | Trudy | Episode: "The Pineapple Incident" |
| 2006 | Inspector Mom | Maddie Monroe | Television film (Lifetime) |
| Cyberchase | Wanda | Voice role; Episode: "Designing Mr. Perfect" |
| 2006–2007 | Inspector Mom | Maddie Monroe | Recurring role |
| 2007 | Random! Cartoons | Katerina "Kat" Metropoulos | Voice role; episode: "Girls on the Go!" |
| How I Met Your Mother | Trudy | Episode: "Third Wheel" |
| 2010 | Big Bang Theory, TheThe Big Bang Theory | Abby | Episode: "The Psychic Vortex" |
| Generator Rex | Claire | Voice role; episodes: "Hermanos", "Operation: Wingman" |
| 2010–2013, 2018–present[۱] | Young Justice | Miss Martian | Voice role; main روْل (40 episodes) |
| 2011 | Generator Rex | Claire | Voice role; episode: "Haunted" |
| G.I. Joe: Renegades | Sister Leia | Voice role; episode: "Brothers of Light" |
| 2012 | Nerdist: Tribute to Science, TheThe Nerdist: Tribute to Science | Herself | Talk show |
| Love at the Christmas Table | Katherine "Kat" Patton | Television film (Lifetime) |
| 2013 | Tasmanian Devils | Alex | Television film (Syfy) |
| Secret Life of the American Teenager, TheThe Secret Life of the American Teenager | Herself | Episode: "Interference" |
| Nerdist: Course of the Force | Bounty Hunter | Episode: "Michael Rooker & CM Punk: Lighstaber Hunt" |
| The Wrong Woman | Ellen Plainview | Television film (Lifetime) |
| 2014 | Transformers: Rescue Bots | Hayley | Voice role; 2 episodes |
| Dancing with the Stars | Herself | Contestant on season 18; finished in sixth place |
| 2015 | King of the Nerds | Herself | Judge |
| 2015, 2017, 2018 | Impractical Jokers | Herself | 3 episodes |
| 2015 | Perfect Match (aka A Perfect Wedding) | Jessica Summers | Television film (Hallmark) |
| Miss America 2016 | Herself | Judge |
| Crown for Christmas | Allie Evans | Television film (Hallmark) |
| 2015–present | Project Mc2 | The Quail | Main روْل (Seasons 1–2,4–5); Netflix original series |
| 2016 | DC Super Hero Girls | Killer Frost | Voice role |
| My Christmas Dream | Christina | Television film (Hallmark) |
| Wedding Bells | Molly | Television film (Hallmark) |
| 2017 | Mommy I Didn't Do It | Ellen Plainview | Television film (Lifetime) |
| Campfire Kiss | Dana | Television film (Hallmark) |
| Coming Home for Christmas | Lizzie | Television film (Hallmark) |
| 2018 | Very, Very, Valentine | Helen | Television film (Hallmark) |
| 2018 | Love in Design | Hannah | Television film (Hallmark) |
| 2018 | Christmas At Grand Valley | Kelly | Television film (Hallmark) |
