Jensen Ackles on the big Soldier Boy twist of The Boys season 3
showrunner Eric Kripke did say there were many reasons why
he couldn't adapt the Homelander-sexing-Soldier-Boy scene from the
comics. Season 3's penultimate episode, "Here Comes a Candle to Light You to Bed," made that more abundantly clear.
Soldier Boy (Jensen Ackles) phoned up Homelander (Antony Starr) in the
final minutes of the episode because he made a discovery.
Back in 1980, he was called into the lab of Jonah Vogelbaum (John Doman), the scientist who
oversaw the creation of Homelander. Soldier Boy didn't know why he was
there, just that it had something to do with genetics. So he beat his meat (his words) into a cup. A year later, Homelander was born.
Yup, Soldier Boy is Homelander's biological father.