CREATE TABLE table_26527 ("Episode" FLOAT, "Contest" CLOB, "Original airdate" CLOB, "Challengers  ( Female ) " CLOB, "Challengers  ( Male ) " CLOB, "Events" CLOB)

Which female challengers featured in episode 28?
SELECT "Challengers (Female)" FROM table_26527 WHERE "Episode" = '28'
SELECT "Challengers (Female)" FROM "table_26527" WHERE "Episode" = '28'