In the trailer for "Fear the Walking Dead" Season 6 Episode 4, titled "The Key," the main characters face a new threat. The clip reveals that the survivors are on the search for a mysterious key that holds great importance. The key is believed to have the power to unlock a potentially crucial resource and, therefore, becomes the focus of their mission.

The trailer further emphasizes the high stakes involved as the characters face both external and internal conflicts. The survivors must not only contend with the ever-present threat of the undead, but also navigate the tensions and rivalries within their group. The search for the key puts their relationships and loyalties to the test, making the mission even more challenging.

The trailer showcases intense action sequences, with the characters battling not only zombies but also other human survivors who will stop at nothing to get their hands on the key. Amidst the chaos, the resilient members of the group are determined to fulfill their mission and find the key, even if it means risking their lives.

Overall, the trailer for "Fear the Walking Dead" Season 6 Episode 4 suggests that this episode will be filled with suspense, danger, and the constant struggle for survival. The search for the key introduces a new and significant storyline, adding an extra layer of intrigue to the series. Fans can expect thrilling scenes and unexpected twists as the characters race against time to secure the key and unlock its hidden potential.