The individual you positioned final is

Ian McKellen (centre picture)

First of all of the actors, so as, are

1. Hugh Jackman
2. Lee Remick
3. Halle Berry
4. Gregory Peck
5. Ian McKellen
6. David Warner
7. Famke Janssen
8. Billie Whitelaw
9. Patrick Stewart

Each of those actors

Appeared in both X-men or The Omen (O-men).

Then

If we exchange every actor with an X or an O relying on which film they appeared in we get a accomplished tic-tac-toe grid as follows

For this to have been a sound sport it should be that the 2 successful strains for “X” had been shaped on the similar time and so the final positioned X is the central one.

Title

Triple T stands for Tic-Tac-Toe.