James Spader
Appeared on: "The Apology" (Season 9, Episode 9)
Role on "Seinfeld": Jason Hanky, a childhood friend of George
Since "Seinfeld": Spader starred on "Boston Legal," and he currently stars on NBC's crime thriller "The Blacklist." He also had a part in "The Avengers: Age of Ultron."
James Spader? Really? Every heard of Pretty in Pink, or Less than Zero, etc etc...