You are the commander of an alien bacterial race that has failed at taking over Earth. The problem is that all natural-born females are immune from infection. The solution? Just create new females from the infected male population.
This idle clicker game starts you off in a host with several body areas to unlock. After fully transforming your host, you can spread to other hosts and mutate your ability to infect your hosts faster.
However, humanity is not going just let you do whatever you want. You'll have to navigate their use of medication and vaccines.