History and specifics
On a 24th century viewscreen display of a tactical situation monitor in an alternate timeline where the Klingon Empire was at war with the United Federation of Planets in the year 2366, Tsugh Khaidnn was listed twice on a star chart showing Klingon allied forces in relation to Federation positions. (TNG episode: "Yesterday's Enterprise", TNG reference: The Continuing Mission)
- SCE eBook: The Future Begins
- TNG episode: "Yesterday's Enterprise"
- TNG reference: The Continuing Mission