The finale is defined by two major losses that shifted the show's dynamic:

Steve and Robin arrive just in time to save the group by ramming the "Todfather" convertible into Billy’s car. Heartbreaking Sacrifices

The episode fast-forwards three months to a somber aftermath. The Byers family—now including Eleven—packs up to leave Hawkins. The season ends on a powerful note as Eleven reads a heartfelt letter Hopper wrote for her, urging her to "keep the door open three inches".