Avengers (Vol 1 1963) Issues 51-100
Roy Thomas continues writing the next 50 Avengers issues to #100, partnering with artist John Buscema on most. Key issues include;
#52 - 1st appearance of the Grim Reaper, Black Panther joins the Avengers
#53 - 1st Xmen Guest Appearance
#54 - 1st appearance of new Masters of Evil (Ultron, Whirlwind, Klaw, Melter, Radioactive Man), 1st cameo appearance of Ultron
#55 - 1st full appearance of Ultron
#57 - 1st appearance of Vision, 2nd appearance of Ultron
#58 - 2nd appearance & origin of Vision, Vision joins The Avengers
#59 - 1st appearance of Yellow Jacket (Hank Pym)
#60 - Marriage of Yellow Jacket (Hank Pym) & Wasp (Janet Van Dyne), 1st appearance of Doctor Strange in Avengers title
#62 - 1st appearance of MBaku & WKabi #63 - 1st appearance of Clint Barton as Goliath
#69 - 1st appearance of Grandmaster, 1st cameo team appearance of Squadron Sinister
#70 - 1st full team appearance & origin of Squadron Sinister (Hyperion, Dr. Spectrum, Nighthawk, Whizzer)
#71 - 1st appearance of The Invaders, Black Knight joins The Avengers
#72 - 1st team appearance of the Zodiac
#78 - 1st team appearance of Lethal Legion. 2nd appearance of MBaku
#80 - 1st appearance & origin of Red Wolf #83 - 1st appearance of Valkyrie
#85 - 1st team appearance of the Squadron Supreme (Hyperion, Nighthawk, American Eagle, Golden Archer, Lady Lark, Tom Thumb)
#87 - Origin of Black Panther #98 - Clint Barton becomes Hawkeye
