For all the aspiring young actors and actresses out there, the most important takeaway from the above interview with "The Mortal InstrumentsCity of Bones" co-star Jared Harris is that "acting's fun."

Harris sounds like he indeed had quite a bit of fun performing alongside Lily Collins and the other young star on the film's elaborate sets. 

In the movie, typical teenager Clary Fray (Collins) discovers her true identity as a shadowhunter, a half-human/half-angel warrior who fights the forces of darkness who are unseen but normal humans. It's based on a series of bestsellers by Cassandra Clare. Harris, who plays Hodge Starkweather, tutor for the Shadowhunters.  

HitFix recently sat down with co-star the "Mad Men" star, who also played the villainous Moriarty in "Sherlock Holmes: A Game of Shadows." He discusses familiarizing himself with the books' dense mythology, in a way that reflected Hodge's own overarching knowledge of the Shadowhunters' legacy.

Harris also touches on working with director Harald Zwart ("The Karate Kid" remake), the film's divergence from "Harry Potter"-style magic, acting alongside with youngsters, "The Dumbledore Connection," and -- of course -- his time on "Mad Men."

"The Mortal Instruments: City of Bones" also stars Jamie Campbell Bower, Kevin Zegers, Jemima West, Godfrey Gao, Lena Headey, Jonathan Rhys Meyers, and Kevin Durand.

"The Mortal Instruments: City of Bones" opens August 21.

Dave Lewis has been a Los Angeles-based entertainment writer and editor for nearly ten years. Originally hailing from Minneapolis, he moved to L.A. in 1996 to attend USC, before working for various periodicals and web sites including a lengthy stint at He joined the HitFix staff in 2011.