In what episode was the character in "Buffy the Vampire Slayer" who was also portrayed by the actor who played John Hawkes in "Underground" introduced?
Riley Finn:  Portrayed by Marc Blucas, Riley was introduced in the 1999 season four premiere episode, "The Freshman", and Blucas was part of the series credited cast for the second part of season four and the first part of season five. Marc Blucas: Marcus Paul "Marc" Blucas (born January 11, 1972) is an American actor, known for playing Riley Finn in "Buffy the Vampire Slayer", Matthew Donnelly in "Necessary Roughness" and recently, abolitionist John Hawkes in "Underground".
"The Freshman"