Help with stupidly hard quiz

[ApocalypseNowt]

Each year my work does a stupidly hard quiz. There are many stages and we get a month to try and do it.

Anyone help me with this stage? there are 21 pictures of celebrities and I've managed to work out who they all are but now I'm stuck on working out the password to the next stage. Each picture has a coloured Roman numeral in it so I assume I have to use those to work out the answer...

Soupdragon for team captain!

S is James stewart...

I think the S might be Speed if we are looking for words to put in a sentence.

@ApocalypseNowt

Soupdragon for team captain!

I'm not sure looking through the GCHQ Quiz Book for inspiration will win me any awards 😂😂 I would never have thought of it if you'd not brought home the Penguin book.

I'm sure the codes refer to words in diamonds. Having only put 3 in .I've for "...speed of the..." which would fit with it being a question. We probably only need the films that correlate to the code along the top .

Any clues on Z?

V is Alicia Vikander - Son of a Gun, The Light Between Oceans...

U for Peter Ustinov

Y is Michelle Yeoh

And Z is Ziyi Zhang

For the code across the top (3E4Z...) I was taking the given letter of the surname, so 3E is third letter of EASTWOOD ie S.

From the clues we've got so far, I get:
SI-PSON-CH-RT-R-A-EDO

I is Jason Isaacs - Peter Pan, Hotel Mumbai...

L is Jack Lemmon - Glengarry Glen Ross, Some like it hot

F is Jodie Foster.

J for Angelina Jolie

P is Michelle Pfeiffer - Frankie and Johnny, What Lies Beneath...

T is Uma Thurman - Mad Dogs and Glory, Pulp Fiction...

@SoupDragon

I'm sure the codes refer to words in diamonds. Having only put 3 in .I've for "...speed of the..." which would fit with it being a question. We probably only need the films that correlate to the code along the top .

That looks like it might work. The only thing that's putting me off a little bit, is wouldn't it make the bottom halves completely redundant? Or perhaps I haven't understood what you're doing.

W is Sigourney Weaver - The Year of Living Dangerously, Gorillas in the Mist...

K is Ben Kingsley: Ghandi, House of Sand and Fog, Exodus Gods and Kings etc..

R=Julia Roberts and K=Ben Kingsley

I think it's taking the nth letter of esch surname. That gives:

SIMPSONSCH-R-CT-RBASEDONE

Simpson's character based on E
E is Clint Eastwood...

McGarnagle!

I think we're only missing D, N and R now. :)

I think the 5-letter film for D is Murder on the Orient Express.

Oh well done SocraticCat!!!!

N is Paul Newman: Hud, Cool Hand Luke, The Sting

It'll be

Mr/Ms Da...

and

Mr/Ms R.e...

I think

polkadots murder on the orient express is a good call - does that make it Willem Dafoe?