The Maze Runner is the fact that he successfully managed to escape the Maze.
The Scorch Trials, Tim made it to Phase Two along with 19 other Gladers after escaping the Maze. He disappeared during the lightning storm that occurred in the Scorch, alongside six others, including Winston, Jack, and Stan. Although his fate is not definitely known, it is quite likely that he died in the storm.
In the Maze Runner film, Tim is present as one of the Gladers. He is seen throughout the movie roaming around the Glade. Later, during the attack, Tim, along with Newt, Minho, and Frypan, save Thomas' group from a Griever before running inside the Council Hall for safety. He manages to survive the Griever attack. The next morning, he accompanies Thomas on his attempt to get out of the Maze. When the group encounter a Griever in the Maze, Tim, along with the other Gladers, charge at the Griever with spears and other weapons. Tim witnesses Mike's death. He is then seen pushing a Griever off the ledge with the others. He later witnesses Peter, Jeff, and Chuck's death. He is one of the Gladers to survive the Maze Trials alongside Thomas, Teresa, Newt, Minho, Frypan, Winston, Jack, and Billy.
In the Scorch Trials film, Tim is shown with the main group in the WCKD facility. He is also seen in the laboratory in the WCKD facility behind Minho. He is seen when the group are put in a room with a table full of cooked food, and is the furthest on the right. He appears in the deleted scene food fight, along with when him and the group follow Janson, and can be seen in the very back with Jack. He then disappears after the deleted scene and from the movie.
In the Death Cure film, Tim is shown to be with the other Gladers when they are hijacking the train to find Minho. He and another boy are shooting at the WCKD guards. He then joins Thomas and Newt on top of the train and manages to escape with the cargo full of immunes. He survives and makes it to the safe haven.