CREATE TABLE table_204_747 (id DECIMAL, "season" TEXT, "skip" TEXT, "third" TEXT, "second" TEXT, "lead" TEXT, "events" TEXT)

what was the only season where kevin martin was the skip ?
SELECT "season" FROM table_204_747 WHERE "skip" = 'kevin martin'
SELECT "season" FROM "table_204_747" WHERE "skip" = 'kevin martin'