Avengers #339 1991

Avengers #339, published in October 1991, features "Final Redemption," the conclusion to "The Collection Obsession" storyline. The Collector reveals his sinister plot to destroy Earth by transforming the Brethren into deadly bacteria. The Avengers race against time to contain the global outbreak. Sersi aids Thane Ector and his brother in forming the Uni-Mind, a pivotal moment as it marks the Uni-Mind's first appearance. This collective entity confronts and defeats the Collector, but at the cost of the Brethren's existence, including the death of Thane Ector, making this issue their final appearance.