SCARY: Zac Efron crosses 150 foot ravine on 'Running Wild with Bear Grylls' (VIDEO)

Zac Efron crossed a 150 foot high ravine on Running Wild with Bear Grylls.

He crawled on a sturdy looking rope and was attached to a safety line, but still... this was scary. I probably wouldn't be able to do it -- unless I was paid, which is probably what happened with Zac, LOL. Maybe he just loves the call of the wild and would do this for free, who knows.

Bear told him not to look down, but Zac did anyway, which threw him off in the beginning.

"Don't look down!" said Bear.

"I did," said Zac.

Zac Efron is ready to become the next big action movie star!

Running Wild with Bear Grylls premieres on Monday, July 28 at 8/7c on NBC.

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