SunDog: Frozen Legacy is a 1984 space trading and combat simulator video game. SunDog was first developed for the Apple II, with version 1.0 being released in March 1984, and version 1.1 (bug fixes) released three weeks later. Version 2.0, which included enhancements and improved performance, was released in October, 1984. An enhanced version was released for the Atari ST in December 1985.