In October 1984 – January 1985, the Machine Man title was resurrected, in a four-issue miniseries written by Tom DeFalco with art by Herb Trimpe (breakdowns only, issues #1-3) and Barry Windsor-Smith (finishes only, issues #1-3 & full art for issue #4), with Windsor-Smith also coloring the entire miniseries & co-plotting issue #4 with DeFalco. This series turned out to be one of the most popular of all the Machine Man titles, tying with previous continuity, but with the action set in the distant cyberpunk future of 2020, starting with Machine Man’s reassembly.
The miniseries was republished again in 1994 as two double-size books, with the name Machine Man 2020. Characters from this alternate future have made appearances in other Marvel books, namely Arno Stark, the mercenary Iron Man 2020.
In 1990, Machine Man guest-starred in Iron Man Annual #11 (part of the “Terminus Factor” storyline). That story created strong hints that the 2020 Machine Man may turn out not to be the true X-51, but instead a duplicate created by Sunset Bain.