Marvel does own the rights to The Punisher, and now an Easter Egg has been spotted in the latest episode of Marvel's Agents Of S.H.I.E.L.D.
While it doesn't directly reference The Punisher himself, it does reference The Punisher's ally, Microchip.
The particular scene sees Sky name-drop a hacker friend who happens to be named "Micro" (via reddit) and is said to be a "crime scene junkie."
This isn't the first Punisher Easter Egg Marvel has used as the Iron Man 3 short "All Hail The King" referenced the Costa family, which actually is responsible for killing Frank Castle's family.
Captain America 2 directors, the Russo Bros., also joked and teased The Punisher made a cameo driving the yellow Penske truck.
Most recently, CM Punk, who is writing a story in the Marvel Comics Thor Annual, mentioned he wants to tackle a new Punisher comic book as well.