Harry could not pinpoint the plot, but he could actively enter several important points along a timeline and alter events at those points to enter other Parallel Universes.
Within the Quantum Realm, time and space were fragmented. The possibilities at a key point could create new branches and help them enter Parallel Universes familiar to him.
In the What If...? series, there was one such world: Peggy Carter injected the Serum and became the first Super Soldier.
This "what if" stirred something in Steve's heart:
What if... it had not been him, but Peggy Carter?
What would that world have become?
Would he still have been that scrawny kid from Brooklyn? Could the same relationship have developed between them? There would be no Captain America there, so who would Steve Rogers become? An unnamed soldier who died on the battlefield? Or Captain America Peggy Carter's teammate? Or...
Peggy Carter of this universe had already lived out her natural lifespan. The Osborn Group could originally have extended her life for a few more years, but she had refused. She no longer had the chance to explore the multiverse, but Steve still did.
Such a different universe held considerable appeal for him, and Bucky Barnes beside him felt the same way.
"So, what do you say?"
"What if I don't want to do it?" After thinking for a long time, Steve asked the classic question.
Harry thought, You look so earnest, yet you're pulling this routine?
"...This is a Group mission. If you give up, I'll find another way to keep it moving. But I believe this mission can also satisfy some of your... personal needs. In theory, we won't lack volunteers."
"Because the Group has plenty of people, right?" Steve smiled. "You know, on the battlefields of the past, I always