Avengers #273 (1986)
By Roger Stern, John Buscema, Tom Palmer
Background: The current roster of the Avengers is Wasp (team leader), Captain America, Black Knight, Hercules, Captain Marvel. Namor has recently left for personal reasons.
So, What Happens? At a bar, Hercules is having a good time showing off and chatting, but he doesn't know that his drinking buddy is the Wrecker, who takes advantage of Herc's short temper to learn of Namor's absence and play up the hero's dislike for the Wasp's leadership. After nearly causing an accident, Hercules goes back to drinking, while the Wrecker reports to his boss Baron Zemo, who has assembled an army of villains and is getting ready to strike the Avengers. However, keeping his underlings in line isn't easy for the Baron, with the Wrecker and others complaining for the lack of action while Moonstone, confident of the crucial importance of her role, starts threatening to wrestle the leadership of the group from him. Moonstone's role is to control Blackout, a near catatonic man capable of tapping into an extradimensional dark force, perfect for neutralizing Captain Marvel whom Zemo considers the most dangerous Avenger. A quick demonstration shows that Blackout can indeed do the trick, but also that he's under Moonstone's complete control, and therefore a further potential threat to Zemo. In order to make Moonstone think twice about betraying him. Zemo arranges a little brawl between Piledriver and Mister Hyde, only to calm the latter down with a powerful sedative and make it look like he's completely obedient to him. Unaware of the sedative, Moonstone is impressed and wonders if the Baron has some secret power. Meanwhile, the Black Knight accompanies the Wasp to an evening gala, but the presence of the Paladin ruins his evening as he's jelous of his flirting with Janet. Thanks to the Fixer, Zemo watches everything through the local cameras and notices the Knight's reaction, planning to use it to his own advantage. Ready for his plan to start, Zemo summons his Master of Evil: Moonstone, Mister Hide, the Wrecking Crew, Blackout, Tiger Shark, the Absorbing Man, Titania, Yellowjacket, Goliath and the Fixer. With a powerful speech, the Baron rallies them against the Avengers, promising to defeat and humiliate them. He also proves his leadership to Moonstone, taking control of Blackout away from her thanks to the circuitry inside his new headband modified by the Fixer. When all the Masters accept to follow him, Zemo orders them to attack Avengers Mansion overnight, quickly battling past the building's defences and capturing Jarvis, who is covering for Hercules on monitor duty, like Zemo had planned. With the local traffic diverted and no witnesses around, within minutes the Masters take control of the Mansion and get ready for phase two of their plan.