In this episode we travel back 500 million years to look at the pure and unadulterated nightmare fuel of the Cambrian explosion. In particular the weirdest creature named after a literal hallucination: Hallucigenia.
* How many pikachu's can you impale on it's back spines?
* Which end is the front?
* Why don't more tentacles have teeth?
* Why is the D&D version 25ft long and backwards?

Show notes!
Hallucigenia walking (Cambridge university)
Green Hallucigenia
Opabinia
Anomalocaris
Wiwaxia 
(and do image searches for the above on google)
Dragon magazine #204, TSR, Creatures that Time Forgot
Tree of life: https://www.evogeneao.com/en/learn/tree-of-life  <-- there are lots of variations, this one shows the Cambrian explosion nicely.