A lot of “Picard” Season 3 had to be shot before Plummer’s arrival, leaving actors to talk to a blank viewscreen to be filled in later. Luckily, Plummer delivered, with Matalas saying, “We were all holding our breath, and [when] she gave that performance, [...] people were congratulating each other. We were so thrilled to have a classic, larger-than-life ‘Star Trek’ villain.”