AVENGERS 337 (1963)

"Mud and Glory" Part 4 of 6. Script by Bob Harris. Pencils by Steve Epting. Inks by Tom Palmer. Cover by Ron Lim and Tom Palmer. As the Brethren close in on their conquest of Earth, the Avengers close in on their closely-guarded secret! Inside Thane Ector's citadel, Sersi reads the Brethren's sacred scrolls to learn more about the alien race. However, her history lesson is interrupted by a furious, jealous, and attacking Sybyl Dorn! Meanwhile 250,000 miles away in the blue area of the moon, Henry Pym begins to put two and two together as T'Challa and Hank McCoy report their discoveries (through the myriad of ecosystems) on the Collector's ship! Could the Brethren's weakness be a simple matter of biology? And at Avengers Mansion, Crystal arrives ready to join the team!