# Mary Mouser

Mary Matilyn Mouser (born May 9, 1996) is an American actress. She is best known for her portrayal of Sam LaRusso, daughter of the original Karate Kid Daniel LaRusso, in the Netflix series Cobra Kai. She was also the voice of Eloise in Eloise: The Animated Series and Lacey Fleming on the ABC series Body of Proof. Mouser took over the role of Karen Grant, Fitz & Mellie's daughter on Scandal in Season 4. She is also known as an influencer on TikTok and YouTube.

## Early life and career

Mouser was featured on the Starz Kids & Family series Eloise: The Animated Series as the voice of Eloise and appeared as the child-lead in the Hallmark Channel original movie A Stranger's Heart. She has done voice work for animated features such as Dragon Hunters, Tarzan II, and Pom Poko, and was a voice actress in the audio drama series, Adventures in Odyssey as Samantha McKay, younger sister of Grady McKay.
Mouser has also appeared in guest starring roles on CSI: Crime Scene Investigation, Without a Trace, The King of Queens, Monk, Inconceivable, Scrubs, One Life to Live and had a recurring role on NCIS as Leroy Jethro Gibbs' daughter Kelly. She also had a series regular role in the CW series Life Is Wild as Mia Weller, for 13 episodes. At the 2006 Best of Fest Awards at the KIDS FIRST! Film and Video Festival, Mouser received the Outstanding Performance Award for her voiceover work in Eloise: The Animated Series. Mouser also guest starred on Lie to Me and in Ghost Whisperer as the character Madison.
Mouser starred in the ABC medical drama Body of Proof as Dana Delany's daughter, Lacey Fleming. Mouser also played the roles of both Savannah O’Neal and Emma Reynolds in the Disney Channel Original movie Frenemies, which was released in 2012.
Since 2018, Mouser plays high school and karate student Samantha (Sam) LaRusso, in the Cobra Kai series, initially launched by YouTube Premium and later on Netflix, where she is part of the main cast. Mouser has also appeared on a Mind Field episode (S2 E5) on the channel VSauce on YouTube. In 2024, she voiced the character Cleo in the audiobook Know Your Newlywed.

## Personal life

In 2009, Mouser was diagnosed with type 1 diabetes. She discussed her experiences in a 2019 YouTube video. In February 2025, when the final season aired, Mouser announced her engagement to Cobra Kai co-star Tanner Buchanan.

## Filmography
### Films

| Year | Title | Role | Notes |
| 2005 | Pom Poko | Additional Voices | |
| 2005 | Son of the Mask | Alvey Avery (voice) | |
| 2005 | Tarzan II | (voice) | Video |
| 2005 | Final Fantasy VII: Advent Children | Additional voices | |
| 2006 | Holly Hobbie and Friends: Christmas Wishes | Lill (voice) | Video short |
| 2006 | Mr. Fix It | Christine Pastore | |
| 2007 | LA Blues | Sara | |
| 2007 | Penny Dreadful | Clara Fowler | Short film |
| 2008 | Dragon Hunters | Zoé (voice) | |
| 2008 | Delgo | Baby Delgo (voice) | |
| 2008 | Ball Don't Lie | Julia | |
| 2009 | Bride Wars | (voice) | |
| 2009 | The Hole | Annie (voice) | |
| 2011 | All Kids Count | Carla | |
| 2014 | Medeas | Ruth | |
| 2014 | Field of Lost Shoes | Libby Clinedinst | |
| 2014 | Alexander and the Terrible, Horrible, No Good, Very Bad Day | Audrey Gibson | |
| 2018 | Gates of Darkness | Michelle | |

### Television

| Year | Title | Role | Notes |
| 2004 | Without a Trace | Amy Rose | Episode: "Nickel and Dimed: Part 2" |
| 2005 | Scrubs | Little Girl | Episode: "My Lips Are Sealed" |
| 2005 | Monk | Princess Girl | Episode: "Mr. Monk Goes Home Again" |
| 2005 | Inconceivable | Kylie | Episode: "Between an Egg and a Hard Place" |
| 2005 | CSI: Crime Scene Investigation | Cassie McBride | Episode: "Gum Drops" |
| 2005 | The King of Queens | Marissa | Episode: "Move Doubt" |
| 2005–2012 | NCIS | Kelly Gibbs | Recurring role, 9 episodes |
| 2006 | Mindy and Brenda | Young Girl | Television film |
| 2006–2007 | Eloise: The Animated Series | Eloise | Voice role; main role; 13 episodes |
| 2007 | A Stranger's Heart | Cricket | Television film |
| 2007 | State of Mind | Ashley Petrovsky | |
| 2007–2008 | Life Is Wild | Mia Weller | Main role, 13 episodes |
| 2008 | Life | Carin Sutter | Episode: "Black Friday" |
| 2009 | Lie to Me | Tyler Seeger | Episode: "Control Factor" |
| 2009–2010 | Chowder | Marmalade / Ambrosia | Voice role; episodes: "A Faire to Remember", "Chowder Grows Up" |
| 2010 | Ghost Whisperer | Madison | Episode: "Dead to Me" |
| 2011–2013 | Body of Proof | Lacey Fleming | Main role, 36 episodes |
| 2012 | Frenemies | Emma / Savannah | Television film |
| 2012 | Drop Dead Diva | Chloe Surnow | Episode: "Crushed" |
| 2013–2015 | The Fosters | Sarah | Episodes: "Saturday", "The Fallout," "Not That Kind Of Girl" |
| 2014 | Saint Francis | Kimberly Quinlan | Television film |
| 2014 | Scandal | Karen Grant | Episodes: "Like Father, Like Daughter," "Baby, It's Cold Outside" |
| 2014 | Criminal Minds | Rebecca Farland | Episode: "Amelia Porter" |
| 2015 | Maron | Sydney Maron | Episode: "Marc's Niece" |
| 2015 | The Devil You Know | Earth Fenn | Unsold television pilot |
| 2015 | CSI: Cyber | Shelby Lockhart | Episode: "iWitness" |
| 2016 | Freakish | Mary Jones | Hulu original series |
| 2017 | Scorpion | Ada Pearce | Episode: "Don't Burst My Bubble" |
| 2018–2025 | Cobra Kai | Samantha "Sam" LaRusso | Main role, 61 episodes |
| 2018 | Happy Together | Diane | Episode: "How Jake and Claire Met" |
| 2019 | Room 104 | Adrianne/Lisa | Episode: "Prank Call" |
| 2022 | Nailed It! | Herself | Episode: "Cobra Kai" |

### Video games

| Year | Title | Role | Notes |
| 2010 | The Lord of the Rings: Aragorn's Quest | Elanor | Video game; voice role |
| 2022 | Cobra Kai 2: Dojos Rising | Samantha "Sam" LaRusso | Video game; voice role |

## Awards and nominations

| Year | Award | Category | Work | Result |
| 2008 | Young Artist Award | Best Performance in a TV Movie, Miniseries or Special – Supporting Young Actress | A Stranger's Heart | Nominated |
| 2008 | Young Artist Award | Best Performance in a TV Series – Supporting Young Actress | Life Is Wild | Nominated |