Watch his reaction to “meeting” one of his unknown ancestors in the exclusive clip above.
Well, let’s start with the maternal side.
“It’s virtually impossible that I exist,” Manganiello toldRolling Stone.

Joe Manganiello finds out he’s descended from slaves, related to Nazis onFinding Your Roots.Kevin Winter/Getty
“You have to take the good with the bad,” Manganiello said.
“And there’s some of that with history.
And now the paternal side.
There’s a monument dedicated to him in Plymouth, Mass.
As a result of this union, Nellie’s parents, Manganiello’s great-great grandparents, disowned her.
“All of a sudden I can see myself clearly for the first time.”
Joe Manganiello’s episode ofFinding Your Rootsairs Feb. 9 on PBS.