Lost Squad — fan-made Source Engine based game in Half-Life® 2 universe about what happened to Barney Calhoun after Half-Life® 2: Episode One events and why he was not in Half-Life® 2: Episode Two You, as Dr. Gordon Freeman's best friend, were last seen leaving City-17's train station with citizens before Citadel erupted amidst a storm of unknown proportions. You must battle against Combine on streets of City-17, give Gordon Freeman back his crowbar and be ready for unforeseen consequences. Lost Squad extends the award-winning Half-Life universe allowing to look at familliar events through the eyes of Barney Calhoun and the gameplay with ability to destroy enviroments, play with friends in co-op mode, fight newly-spawned creatures and much more.