The Flying Doctors (1986) : 5x8

An aboriginal couple, the woman pregnant, has a car accident, but is all right. The man, Joe, gets a job on a farm and his wife Sheena accompanies him. Joe gets fired and they both move to an aboriginal camp nearby. Sheena is about to have her baby but something is wrong. Joe goes for help, but is beaten up. Finally David and Geoff comes and they also find out about Sheena. Geoff realizes he won't be back in town for his wedding which will take place the following morning. Kate refuses to postpone the wedding, which means they are joined together in holy marriage over the radio!