However, seeing Ioan Gruffudd, David McCallum and 'Titan' in your post, I'll point out that both actors portrayed real life characters (Harold Bride and Harold Lowe, respectively) in film versions of the Titanic story. ('A Night to Remember', 1958, for McCallum and 'Titanic', 1997 for Gruffud). Beyond that though, I haven't got a clue!
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