Prison Break

The details on Mark Pellegrino’s Prison Break character grow fuzzy with time — “I feel like I was an arms dealer or something” — but his reasons for appearing in two Season 4 episodes remain crystal clear. “Matt Olmstead is the creator and writer of the show,” he says. “He tends to use me in everything he does.” In fact, Pellegrino’s recent Chicago P.D. stint was a favor for the producer, who needed to fill a vacancy quickly after another actor dropped out. And even Mark Pellegrino’s having pneumonia didn’t stop him from getting the job done. “I have loyalty issues,” he says, laughing. “If you’ve stood in the gap for me, I’m going to stand in the gap for you — even if it kills me.”

TV Line