M-Tron (also written M:TRON) was a LEGO Space subtheme released in 1990 that consisted of 8 sets where the M-Tron were depictedas a rescue and repair faction in all LEGO catalogs except for the United States, where they are described as a mining faction. M-Tron was also the last space theme to carry the LEGOLAND banner and was changed to just LEGO System.
1991 LEGO Sets
1991 brought LEGO Paradisa, a pastel-toned, beachfront subtheme within Town designed to broaden LEGO’s appeal. Pirates added the Imperial Guards, while Space introduced Blacktron II with modular white-and-black spacecraft. The 9V Train system replaced earlier electric formats, simplifying operation with metal track rails. Technic advanced with motorized models like the Control Center, highlighting LEGO’s growing focus on realistic engineering and interactivity.