CREATE TABLE table_19807 ("#" FLOAT, "Episode" TEXT, "Writer" TEXT, "Director" TEXT, "Original air date" TEXT, "Viewing figure" TEXT)

What is the original air date of the episode directed by Paul Marcus?
SELECT "Original air date" FROM table_19807 WHERE "Director" = 'Paul Marcus'
SELECT "Original air date" FROM "table_19807" WHERE "Director" = 'Paul Marcus'