Easy. You add some additional instrumentation and electric guitar to an already epic and thoroughly awesome intro theme. I found this wonderful heavy adaption on youtube months and months ago, complete with heavy metal death roar in the middle of it, and saved it to my harddrive where I listen to it on average once a day.
Come revisit this with me. Good gravy I love this intro. And yes, it's supposed to be this small, sadly if it gets bigger it gets pixelly :(
For the love of god someone start screening Season Two.