Cos if I said "actor x is playing character y" that might be, but I don't believe it's a spoiler to say:
Bill Paterson has been sighted filming today
His character? I dunno, he's just a guy spotted filming on a roof, wearing a lab coat. So I'd guess some sort of scientist.
Bill Paterson has been sighted filming today
His character? I dunno, he's just a guy spotted filming on a roof, wearing a lab coat. So I'd guess some sort of scientist.