CREATE TABLE table_25931 ("No." FLOAT, "#" FLOAT, "Original airdate" TEXT, "Performer 1" TEXT, "Performer 2" TEXT, "Performer 3" TEXT, "Performer 4" TEXT, "U.S. viewers  ( millions ) " TEXT)

What is the highest episode number?
SELECT MAX("No.") FROM table_25931
SELECT MAX("No.") FROM "table_25931"