Here’s Catelyn with another new addition to the cast: the Blackfish, Ser Brynden Tully. Only shot of Clive Russel in this featurette, so far as I can tell. Note, however, the scale armor—it’ll show up on another Tully later on, and is obviously a reference to the fish that is their sigil.
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S3, In Production, Catelyn Stark, Brynden Tully, Behind the Scenes