Collision (2009) is a gripping British five-part drama centered on a devastating multi-vehicle crash outside London. As detectives investigate what caused the collision, the lives of the victims, survivors, and witnesses gradually intertwine, revealing secrets, relationships, and unexpected connections. Told through shifting timelines and multiple perspectives, the series blends police procedural, mystery, and human drama, showing how one catastrophic moment can expose the hidden stories behind seemingly ordinary lives.