Akbar Gbaja-Biamila and Kristine Leahy. Celebrities brave the course for 'American Ninja Warrior's' second annual Red Nose Day edition, including one intrepid ET reporter. 'Celebrity Ninja Warrior ...

Cast changes also came about, notably with the addition of Kristine Leahy ... Fans may also recognize Leahy as a co-host of NBC's "American Ninja Warrior".