CREATE TABLE table_16572 ("Character" TEXT, "Portrayed by" TEXT, "First appearance" TEXT, "Last appearance" TEXT, "Duration" TEXT, "Episodes" TEXT)

Which actors first appeared in episode 'Blink' 1, 2, 3?
SELECT "Portrayed by" FROM table_16572 WHERE "First appearance" = 'Blink" 1, 2, 3'
SELECT "Portrayed by" FROM "table_16572" WHERE "First appearance" = 'Blink" 1, 2, 3'