After the আপনি defeat your shadow, আপনি face the 'Mysterious Warrior'. After the আপনি defeat him, he gives his dying speech and আপনি later find Marian returned to life. The Nes & PC Engine version feature this ending.
The first Double Dragon game, please note that i'm not going to post the nes version here becuase it was infamous for lacking co-op play, making Jimmy a boss & an awful vs. mode