This is the most popular destination. Search for "Game of Thrones - Third Season" and look for entries tagged with "English - Forced." Users often upload specific files for the Dothraki and Valyrian scenes.
To save you hours of clicking, the that bundles all 10 episodes into one .zip file can be found via the MKVToolNix forum archives. Users there have extracted the forced subtitle tracks from the official Blu-ray discs. This is the most popular destination
Watching can be a challenge if your copy doesn't include the "forced" subtitles for Dothraki and High Valyrian dialogue. In this season, crucial plot points—including Daenerys Targaryen's conquest of Astapor—rely heavily on foreign language scenes that require translation for the viewer to understand the stakes. What Are "Forced" Subtitles? This is the most popular destination