When we gave Endgame co-star Patrick Gallagher ("Hugo") a small video camera to tote around during downtime on the set, we had no idea what he'd come back with. Perhaps to the chagrin of some co-stars -- and the delight of others -- Patrick took the job quite seriously and turned in an amazing glimpse of the fascinating ecosystem that is a modern television production.

Join Patrick as he gives us a behind-the-scenes look at the people who make Endgame happen -- from craft services and script supervisors, to co-stars and smoking buddies. And polar bears.

In Part 1 of the series, we go inside the Endgame readthrough room, as cast and crew prepare to read their scripts together for the first time.