- It's a casting nightmare tohave three different people

you're trying to cast as Patrick.

One of the first audition tapes

that I saw was from Sean.

When I saw him, I couldn'tunsee him as Patrick.

- I do not know what to say

or how I can say anymore

about the children of God who are dead,

whom the sword has touched so cruelly.

- [Jarrod] Cut.

I like that take, Idon't need another one.

- I had the opportunity to dip my toe

into the water initiallyabout 16 years ago

with a previous documentary.

I was playing the young Patrick.

So now I've got the chanceto go through his experiences

in the later part of his life.

- And then when we were looking

for a younger Patrick,

we needed to have someonewho looks like Sean,

but I have to have someonewho can really play this part

and when we came across Robert McCormack

it was such an easy choice.- Action.

- I'm very grateful tobe playing Saint Patrick

because he's such an iconicfigure for the Irish people.

He's celebrated everywherearound the world,

so it's very exciting to play him.

- We never planned onhaving John Rhys-Davies

actually play old Patrick.

- We initially just had himon to do the voiceover work

and we asked him would he come over

and play old Patrick onlocation and he agreed.

- You can see it's the same dress.

We are playing the sameperson, Saint Patrick.

- Patrick is a great paradoxof energies and emotions

and he's a wonderful character.

- [Jarrod] To actually haveJohn Rhys-Davies playing

the actual role, he fits rightin with our other Patricks.

They totally work.

(dramatic music)