Unitron was a LEGO Space subtheme released in 1994 that consisted of only 4 sets until it was discontinued in 1995. The Unitron were a military themed group that was good and took over policing space from the Space Police 2 faction. Unitron also features elements from the classic Futuron line, as it revolved around a large monorail system.
Unitron consists of 4 sets that ran from 1994 to 1995. As of today,
6991 Monorail Transport Base is the most valuable Unitron set with an estimated new/factory sealed value of $2,628.
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