A look at the impact of the feast across the vast state of Alaska. What does the future hold for our characters?If our predictions are right, salmon should have arrived, in their millions. Liz Bonnin will be live at Katmai National Park to witness bears and if we're really lucky, wolves running up and down the rivers chasing after salmon. If there's enough fish these two top predators will happily eat side by side, but you never know what will happen when they meet.Steve Backshall will be on board a boat heading to the epicentre of the marine feast, on the trail of orcas and humpbacks. This is the only place in the world where humpbacks perform bubble netting, a spectacular feeding behaviour where they perform synchronised dives, blowing bubbles as they rise, before erupting on the surface to catch fish.Matt Baker will be at the salmon finishing line, the end point of their incredible migration where they undergo incredible body changes from silver to red, their entire shape shifts and the males compete in violent fights. This is what our black bear family has been waiting for, and we will follow the cubs as they try to catch their first fish.The team goes on an expedition to the wilds of Kodiak Island, in search of the world's largest land predator - the legendary Kodiak bear. It's make or break for one fisherman, who depends on this week for his entire year's salary.