English subtitle tested and verified on release:
Star.Trek.The.Motion.Picture.The.Directors.Edition.1979.1080p.BluRay.x264-OLDTiME_en.sdh
It can also be used for other releases, just rename it!
When an unidentified alien destroys three powerful Klingon cruisers, Captain James T. Kirk returns to the newly transformed U.S.S. Enterprise to take command.