You may know him as the caretaker of Hogwarts in “Harry Potter” or even as Walder Frey on HBO’s “Game of Thrones,” however these days David Bradley, 73, is most excited about his role on FX’s “The Strain.”

“The Strain” is based on a trilogy of novels that follow a doctor with the NYC Center for Disease Control Canary Team as they attempt to discover the cause of a viral outbreak that kills the crew and passengers of a plane. The bug turns out to be an actual strain of vampirism.

Bradley spoke with FOX411 about his role in the “Potter” franchise and how it compares to his work on “The Strain.”

“It’s another character that is quite specific and visual and I must say my contribution to ‘The Strain’ is obviously much more than it was in the ‘Harry Potter’ films,” he explained. “My character is leading the charge, so it’s a much more involving part because he is so much a part of the story.”

At The Television Critics Association panel for “The Strain,” creator Guillermo del Torro explained the show’s specific five-season plan.

“From the very beginning, we had really talked about the first book being the first season, the second book being the next two seasons and the third book the last two seasons,” he said. “We’ve stuck to that game plan.”

Bradley works alongside with Corey Stoll and Mia Maestro, and he said has a love for Professor Abraham Setrakian, the character he plays.

“Here I’ve got much more responsibility, which I do relish and I do love doing.”

Executive Producer Carlton Cuse said although there are elements of horror, “The Strain” is more of an adventurous show like “Indiana Jones” or “The Last Crusade.”

“It’s not that scary — it’s not just a horror show,” he said. “The material lent itself to a big pulpy engaging type of storytelling.”

“The Strain” is in its second season now, and on Friday, it was announced that is has been picked up for a third season to air next summer.

You can follow Blanche Johnson on Twitter @blancheFOXLA.