Directed by Doc Negation, the Proto-Corpsmen swarmed Engima.  When one was lucky enough to roll a "1" and hit him, he also transformed so that he suddenly looked exactly like Enigma (complete with uniform, pouches, etc.)!

Meanwhile, not far away, one of Summoner's duplicates was surprised by N-Matter Man, who surprised him by attacking out of a swarm of gray darkness.  He turned and engaged this new threat!

Doc Negation, though enraged, also was smart enough to realize that his force field was nearly gone.  He flew up (standing on a flying disc) and began a discussion with his opponents.

The concluding episode/issue:

#372 - A Dangerous New Adversary – Goliath and Warp depart and the others retire to Rune’s Sanctum to recover.  Afterwards at the Guardians’ Base they research Doc Negation and the villains they just faced, discovering that most are malcontents with origins involving scientific accidents.  A week passes, and an invitation is received requesting that Enigma meet with Doc Negation at the Smithsonian.  The Guardians Council meets and discusses Warp, recent contact by the Host, and the invitation.  On Thanksgiving Enigma, Summoner, Rune, and Angelus visit the Smithsonian Museum of Natural History.  Doc Negation greets them in the crowded Human Evolution exhibit, inviting Enigma to serve him as one of the Universals.  Enigma defiantly spurns the Master of Mutation, and numerous nearby civilians transform into Proto-Corpsmen!  The N-Matter man joins the fight against the heroes, and the two sides furiously battle, with most of the enemy focusing on Enigma.  Suddenly Doc Negation halts the assault and informs the adventurers that he has heroine Evelyn Epoch as a hostage.  The vigilantes allow their opponents to retreat, and in exchange the evil mastermind gives the location of his captive.