Avengers: The Crossing is one of Marvel's most ambitious and divisive mid-90s storylines — a complex conspiracy narrative revealing that Iron Man had been a secret agent of Kang the Conqueror for years, manipulating events from inside the team. The storyline required the teenage alternate-universe version of Tony Stark to replace the compromised adult, a desperate editorial solution to the dead-end the Crossing's plot had created. Bob Harras coordinated a crossover that remains historically fascinating for how thoroughly it was reversed in subsequent years.