The ozone layer is expected to be depleted by the year 2024, according to estimates.. It is up to MacLeod and Rameriz to fix matters. MacLeod and Ramirez's homeworld, Ziest, as well as a company that stands to gain financially from the alleged absence of ozone, have expressed opposition. As a result of flashbacks, MacLeod and Ramirez's banishment from Ziest is explained.