In a crossover episode titled Urban Rangers, Kevin Tighe and Randolph Mantooth appear in Sierra as their EMERGENCY! characters. Story: Johnny and Roy arrive at park headquarters, (in Randy's Land Cruiser) to participate in a cross-training program between the LA County Fire Department and the Sierra National Park Rangers. For Johnny and Roy this involves Mountain Rescue training. Some of the other story lines are: They participate in the attempted capture of Cruncher the wayward bear. Johnny tries to date Julie, the only female Park Ranger assigned to the unit, but keeps getting interrupted. Roy considers a career change to become a Park Ranger.
Johnny and Roy go off alone on an easy day climb as part of their training and come across an injured climber, Johnny stays with the injured person and Roy goes for help. Roy, while running to get help, trips, falls, and sustains a head injury becoming unconscious; he is carrying his climbing helmet - not wearing it. The Park Rangers, noting that they are over an hour late in getting back go searching for them and find Roy still unconscious. The Rangers transport Roy to the park hospital; find Johnny and the injured climber and they too are rescued. While visiting Roy in the hospital, Johnny, learning that Ranger Julie is now unavailable, tries to make a date with Roys nurse.
