BROOKE: Thought I'd do a little snake wrangling to get

prepared for 21 days in Africa.

Naked.

Not afraid.

And--

Maybe a little afraid.

My husband, Matt Wright, has been on "Naked and Afraid"

twice.

[YELLING]

[CHEWING]

I'm tired of looking at his satchel and, frankly,

smelling it.

I would love the opportunity to get out there and have my own.

Yee-haw.

Woo.

My name's Dylan McWilliams.

I'm from Grand Junction, Colorado.

I'm 20 years old.

Most people know me as the guy who was bit by a bear,

a shark, and a rattlesnake.

REPORTER: He woke up with his head in a bear's mouth.

A bear had a hold of my head and was dragging me.

The bear let off because I was punching him in the face

and poking his eyes.

I don't think he liked that too much.

REPORTER: A surf vacation for Dylan

McWilliams suddenly turned into a life-or-death struggle.

Something hit my leg pretty hard,

and I saw a shark underneath me.

REPORTER: McWilliams says a six-foot tiger

shark bit his leg.

DYLAN MCWILLIAMS: The shark kind of just grabbed like that.

REPORTER: Three years ago, Dylan McWilliams was

also bitten by a rattlesnake.

The odds of that happening to one person

is 893 quadrillion to one.

Surviving in Africa where there's lions

and crocodiles and leopards--

what am I thinking?

Why am I doing this?

It's mind-blowing.

I'm coming, Africa.