Zac Efron

Zachary Levi, Kristen Bell, Dakota Fanning are among the many celebrities joining the fight against cancer.

In a new Stand Up to Cancer PSA entitled "Change the Odds" and narrated by Fanning, viewers get an overview of the low odds of several scenarios happening, from dating a supermodel to getting stuck in an elevator (Zac Efron, unfortunately, gets stuck with a gaggle of girls to illustrate this one.) But the alarming statistic comes at the end: In the U.S., one in two men and one in three women will be diagnosed with cancer.

Also featured in the PSA are Efron's girlfriend Vanessa Hudgens, Glee's Naya Rivera, Jon Heder and Scrubs' Donald Faison.

Watch the video: