Watch Criminal Minds The Fight Season 5 Episode 18 Stream Online. When a group of homeless people are found dead, there is some sort of a mystery or incident that might lead to this crime. The group will be in this task in the new Criminal Minds The Fight Season 5 Episode 18. In this episode, The BAU team travels to San Francisco to investigate the murders of several homeless men and teams up with a separate group of BAU operatives who are working another case they think is connected. the Criminal Minds The Fight S05E18 shows on Wednesday, April 07, 2010 9:00 PM-10:00 PM EST on CBS. Watch Criminal Minds The Fight Season 5 Episode 18 Stream Online.