Writer: Roy Thomas
Penciller: John Buscema
Inker: Tom Palmer
Letterer: Art Simek
Featured Issue: Avengers #79
In Avengers Mansion, reserve members Iron Man and Thor arrive, responding to the emergency summons of their fellow Avengers. The pair can only surmise that something major must be happening based on the grim expressions on everyone’s faces. With pleasantries out of the way Captain America declares that the team must stand together or else they will almost certainly fall. Noting that Black Panther is missing, Cap recalls the attack he suffered at the hands of M’Baku and the solo mission on which Black Panther embarked. Based on the available evidence the Avengers are forced to conclude that they face not just one villain but a cabal of such rogues. Before the Avengers can formulate a plan, Scarlet Witch points out that Black Panther has recently begun teaching at a local school and that classes were about to start in a few short minutes. Quickly donning a disguise, Vision volunteers to inform the schools administration that Black Panther’s alias, Luke Charles, will not be in class today. As the synthazoid departs, Iron Man wonders if the villains were having a similar meeting in which the fate of the Avengers was being decided.
Little does Iron Man realize how correct he really is. Though they are meeting in similar fashion, the Lethal Legion fill the room with their contempt for one another. Melodramatically grandstanding in front of the others, Grim Reaper attempts to remind the assembled villains that it was he who was responsible for the formation of their team. Reaper takes things a step too far when he claims credit for the capture of Black Panther and Monica Lynn. M’Baku promptly interrupts Reaper and demands to know why they have yet to kill Black Panther. Grim Reaper responds that it would be much more fitting that all the Avengers die together and proceeds to give orders to the rest of the team in preparation for ambushing the Avengers in their mansion. With this the villains depart.
Almost the moment Grim Reaper leaves the room, the force field imprisoning Black Panther and Monica Lynn disappears. Not waiting for an explanation to the fortuitous event, Black Panther smashes his way out of the restraints and begins to scour the base for a transmitter in order to warn the Avengers of the imminent attack. Managing to contact his teammates, he informs the Avengers of the Prometheus Priority alert. Just as he finishes explaining the situation to the Avengers, Black Panther’s transmission is cut off by Grim Reaper. Unknown to the Avenger, Reaper had set him up and allowed him to escape and contact the Avengers as part of his master plan. While Black Panther lands pummeling blows on Grim Reaper, the deadly villain reveals that he has been training and preparing. To back up his words, Grim Reaper unexpectedly gases Panther and Monica Lynn in to unconsciousness.
At Andrew Jackson High School, Vision arrives to complete his mission. Although he successfully covers for Black Panther in his absence, his visage isn’t quite as convincing as he believed and his chilling, inhuman voice leaves the secretary haunted and flustered.
In the sewers beneath Avengers Mansion Goliath and Scarlet Witch begin their search for the villains they know to be lurking. Unfortunately for them, the pair of Swordsman and Power Man lay in waiting, using a high intensity light beam to blind the heroic duo. Although Power Man is able to take advantage of Goliath’s momentary disability, Scarlet Witch uses Swordsman’s voice to locate him and rain down hex bolts on him. As Goliath regains his sight he is able to turn the tables on Power Man and the villains find themselves on the verge of defeat until Swordsman gases the heroes.
Meanwhile, Captain America and Quicksilver explore the power station. The Avengers suddenly find themselves under attack from M’Baku and the Living Laser. While Cap and M’Baku square off in a rematch of their earlier encounter, the Living Laser attempts to demolish Quicksilver. Unable to keep up with Quicksilver, Living Laser gets lucky when debris from his attacks manages to trip up Quicksilver, removing him from the fight. Meanwhile Cap is overwhelmed when M’Baku uses damaged equipment to shatter the hydraulic generators behind Cap, nearly drowning the star-spangled Avenger.
Returning to their lair, the Lethal Legion imprisons the disabled Avengers within a mammoth hourglass. The hourglass is then slowly filled with a toxic vapor as Grim Reaper watches excitedly, vengeance for the death of his brother so close at hand. As the vapors continue to collect, Power Man returns dragging Vision along with him. The Legionnaires decide to throw him in with the others, hoping he would also die. Along with Vision, Power Man returns with secret files about each of the Avengers. As Grim Reaper reads the files, he discovers that Vision’s brain pattern is based on that of his deceased brother, Wonder Man. Panicking and terrified of losing his brother yet again, Grim Reaper smashes open the hourglass, saving the heroes. As Vision crawls out, gasping for air, M’Baku realizes that Vision is not who he seems to be, but is in fact Power Man. His cover blown, Vision abandons his Power Man disguise and attacks, shattering Swordsman’s sword. Soon the rest of the Avengers join the fight, admitting they were playing along. Black Panther’s use of the Prometheus Priority informed the Avengers that they were walking into traps and as such they were prepared. With the Lethal Legion defeated, Vision stuns the Avengers by announcing his departure from the team. His feelings of alienation and lack of humanity have finally caught up with him and Vision must go and find his place in the universe.