After the Battle of Metropolis, Sinestro retreated to the antimatter universe. He made a pact with the Anti-Monitor and embraced the doctrine of spreading fear. The Green Lantern Corps is once again reformed with the return of Hal Jordan so Sinestro decides to found the Sinestro Corps, offering yellow power rings and a role in the Corps to the most feared and savage warriors of the universe. He is also revealed to have masterminded the death of Kyle Rayner's mother by having the sentient virus Despotellis invade her as part of a plot to break Kyle's will so that he can become Parallax's latest host.