Michiel travels back to his hometown Leiden (NL), to meet a Canadian professor in biochemistry. What are antibiotics, really? And exactly how big is the problem of antimicrobial resistance? Spoiler alert: it's pretty big. Meanwhile Minerva learns about an ancient relationship and: has a surprising encounter!

Biopolis - into the microbiome is created by Michiel van Poelgeest for the Max Delbrück Center. Script consulting by Jeff Emtman, additional narration by Colette Kinsella.