CREATE TABLE table_48780 ("Title" TEXT, "Season" FLOAT, "Director" TEXT, "Teleplay" TEXT, "First Broadcast" TEXT)

What is Teleplay, when First Broadcast is April 10, 1981?
SELECT "Teleplay" FROM table_48780 WHERE "First Broadcast" = 'april 10, 1981'
SELECT "Teleplay" FROM "table_48780" WHERE "First Broadcast" = 'april 10, 1981'