CREATE TABLE table_name_27 (country VARCHAR2, series_premiere VARCHAR2, tv_network_s_ VARCHAR2)

What country has a series premier of unknown and mbc action as their TV network?
SELECT country FROM table_name_27 WHERE series_premiere = "unknown" AND tv_network_s_ = "mbc action"
SELECT "country" FROM "table_name_27" WHERE "mbc action" = "tv_network_s_" AND "series_premiere" = "unknown"