The Swarm
![](https://whobackwhen.com/wp-content/uploads/the-swarm-invisible-enemy-doctor-who-back-when.jpg)
An alien virus led by the intelligent Nucleus, The Swarm infected host humanoids, giving them funky eye makeup and a thirst for world domination.
Podcast
C093 The Invisible Enemy
Anti-body pillow fights, a fantastic voyage and the universe-threatening ejaculate of a megalomaniac space shrimp