Sara Jean Underwood

Sara Jean Underwood (サラ・ジーン・アンダーウッド) is the 2009 playmate of the year in playboy magazines who competed in KUNOICHI 8. In her only appearance so far, she was the only one in her foursome group to beat the First Stage. In the Second Stage she made it past the first two obstacles easily, however on the Buyoishi she started shaky and while trying to rush it, she slipped and her feet hit the water.It is also known that she was given the coveted 100 as she ran the first stage at the very last tournament at the time.

Underwood also tried out the American Ninja Warrior 3 qualifying course just for fun. She only managed to reach the third step of the Quad Steps, due to her feet slipping on the step because of it being wet, causing her to fall in the water.