In this episode, Aideen and Julian talk about how antibodies contribute to making humans resilient to foreign pathogens. The episode starts by entertaining the possibility of a microscopic alien invasion to show generally how immunology can play a role in a variety of fields, including space travel. We cover the genetic basis for the diversity and specificity of antibodies responsible for eliminating disease-causing agents. Additionally, we talk about how antibodies can be useful even outside our bodies, such as in a laboratory setting. We close the discussion by touching on the relevance of antibodies as scientists search for new COVID-19 treatments and prevention methods.