10 'NCIS' Guest Stars You Probably Forgot About
Sterling K. Brown
The This Is Us
actor played a villain in Season 11.
Known for her role on Pretty Little Liars
, Bellisario starred as Sarah McGee, who is Agent McGee's sister.
Everyone loves him as Cameron Tucker on Modern Family
, but he was scary as a killer in Season 6.
She's known as the first female US President on Scandal
but in 2004 she played a villain on NCIS
Baby Breslin played a blind girl on the show.
Millie Bobby Brown
Famous for playing Eleven in Stranger Things
, Brown was once a killer on NCIS
The heartthrob starred on an episode in January 2006.
Jamie Lee Curtis
She appeared as Dr. Samantha Ryan, who was a girlfriend of Leroy Jethro Gibbs.
The Two and a Half Men
star played Dr. Cyril Taft, who saves Gibbs' life.
The Grace and Frankie
star played McGee's grandmother, Penelope Langston.
After 15 seasons on television, you can say NCIS has weathered some intense storms — cast shakeups, character deaths, Mark Harmon's haircut.
The show continues to be a powerhouse for CBS, raking in high audience numbers each week, so it's no surprise the procedural drama was just renewed for Season 16 in April.
They worked together for 16 years.
With that longevity comes quite the number guest stars, with roles ranging from big to small. And since the series has been on for two decades, eagle-eyed fans can see much younger versions of some of the biggest stars on TV today.
Click through the gallery above to find out which big-time actors once starred on NCIS.
NCIS, Season 16, Fall 2018, CBS