user: Question: What country has a series premier of Unknown and MBC Action as their TV network?
Columns: ['Country', 'TV Network(s)', 'Series Premiere', 'Weekly Schedule', 'Status']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Australia', 'Fox8', 'Unknown', 'Weekdays @ 2:30 pm', 'Currently airing']
SQL:

assistant: SELECT "Country" FROM "Table" WHERE "Series Premiere" = 'Unknown' AND "TV Network(s)" = 'MBC Action';