And they did.
These "Harbingers" turned out to be the original JOKE who had been trapped in 1900s earth:
Mr Mystery/Kenny Thistle
Thoth and Zero Agency attempted to eliminate the terrestrial Ever-Men, but failed. However in the meantime they were building a Ancient Evaporator Cannon that killed all the Ancients in the galaxy, apart from the "Harbinger" Chenook. This Chenook took the place of JOKE's Chenook on the team.
Currently In Jail:
Hamilton Zeus (Possessing the body of Silence Zeus)
G.E.E.K. (Genetic Entity Engineered for Killing)