CREATE TABLE table_24864 ("No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT)

Who wrote when the original airdate is April 5, 1987?
SELECT "Written by" FROM table_24864 WHERE "Original air date" = 'April 5, 1987'
SELECT "Written by" FROM "table_24864" WHERE "Original air date" = 'April 5, 1987'