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50 celebrities you totally forgot were on 'NCIS'

INSIDER Logo By Gabbi Shaw of INSIDER | Slide 1 of 51:  Over the past 15 years, the landscape of television has changed drastically, but one show has been there through it all: "NCIS." Through three presidents, two decades, and many drastic cast changes, "NCIS" has consistently remained a ratings powerhouse. It's been the  most popular show on TV for years, and its stars are consistently fan favorites. Not surprisingly, it was  renewed for a season 16 in April 2018. Throughout its 350 episodes, some familiar faces have come into the team's orbit, like Michelle Obama, Zac Efron, Abigail Breslin, and Millie Bobby Brown. Keep scrolling to see if you can remember 15 seasons worth of famous guest stars.Warning: Spoilers ahead for those who haven't watched all 15 seasons.

Over the past 15 years, the landscape of television has changed drastically, but one show has been there through it all: "NCIS."

Through three presidents, two decades, and many drastic cast changes, "NCIS" has consistently remained a ratings powerhouse. It's been the most popular show on TV for years, and its stars are consistently fan favorites. Not surprisingly, it was renewed for a season 16 in April 2018.

Throughout its 350 episodes, some familiar faces have come into the team's orbit, like Michelle Obama, Zac Efron, Abigail Breslin, and Millie Bobby Brown. Keep scrolling to see if you can remember 15 seasons worth of famous guest stars.

Warning: Spoilers ahead for those who haven't watched all 15 seasons.

© Cliff Lipson/CBS
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