'Mad Men': Where Season 4 left off

At the end of Season 4 Don Draper (Jon Hamm) had surprised everyone, including himself, by proposing marriage of his secretary, Megan (Jessica Pare), to marry him while on a trip to California with the kids. She accepted. So, as predicted by Dr. Faye Miller who he'd dated earlier in Season 4, guys like Don (who had recently finalized his divorce from Betty) are usually remarried within a year.