From American Ninja Challenge 4, Olivia Munn takes a look at the Ninja Killer, presented by Venom Energy Drink, an obstacle course designed ...

The American Ninja Challenger with the best track record, Levi Meeuwenberg is back for another shot at the course, and, in this clip from ...

In this clip from American Ninja Challenge 4, we take a look at pint-sized stuntwoman Luci Romberg, who is returning to Japan to take ...

Olivia Munn gets to be the sole deciding vote on the American representative to take on the 'Ninja Warrior' course, and here, she tells us ...

After a long period of deliberation, Olivia Munn makes her selection for the newest American to run the 'Ninja Warrior' course, and it's ...

American Ninja Challenge pick, and stuntwoman, Luci Romberg takes on Ninja Warrior's first stage.

American Ninja Challenge pick Levi Meeuwenberg returns to the Ninja Warrior course.

American Ninja Challenge pick David Campbell takes on the Ninja Warrior course.

After falling on the first obstacle last year, Olivia returns to the Ninja Warrior course determined to tackle the Sextuple Step.