Netflix's new drama series,, Katherine Heigl and Sarah Chalke play best friends whose powerful bond stands the test of time — 30 years, to be specific — and only ET has the exclusive first look at the official decades-spanning trailer. Adapted from Kristin Hannah's novel, unlikely duo Tully (Heigl) and Kate (Chalke) meet when they're both 14 years old and they can’t be any more different. While Tully is brash and bold, Kate is the shy girl you never notice.