Question: what is the released when the series is sorted 6Y/AI?
SQL: SELECT "Released" FROM "2-1620397-5" WHERE "Series Sorted" = '6Y/AI';

Question: who is the featuring when the doctor is the 6th and the series sorted is 6Y/AK?
SQL: SELECT "Featuring" FROM "2-1620397-5" WHERE "Doctor" = '6th' AND "Series Sorted" = '6Y/AK';

Question: what is the series sorted when the released is May 2012?
SQL: SELECT "Series Sorted" FROM "2-1620397-5" WHERE "Released" = 'May 2012';

Question: who is the featuring when the series sorted is 6EB/B?
SQL: SELECT "Featuring" FROM "2-1620397-5" WHERE "Series Sorted" = '6EB/B';