Morgan slips up navigating the meltdown that's transforming the Alaskan wild; Marty's high altitude hunt takes him to the top of Kodiak Island's most treacherous peaks, and Eustace and Preston bring down a giant.

An early thaw puts Morgan's supply drop on thin ice; Marty's high altitude hunt takes him to the top of Kodiak Island's most treacherous peaks; Eustace and Preston bring down a giant; the early melt unleashes bears weeks ahead of schedule; extended.