CREATE TABLE table_2576 ("No. in series" CLOB, "No. in season" CLOB, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( millions ) " CLOB)

What episode number in the series was 'igo nuclear'?
SELECT "No. in season" FROM table_2576 WHERE "Title" = 'iGo Nuclear'
SELECT "No. in season" FROM "table_2576" WHERE "Title" = 'iGo Nuclear'