The Day that Blaargians Hated Pink is a terrible accident that took place in late 2015.
This is an episode of Irken Conquest: Season One
A few inches of Polilinkqusk escaped from The LSD into Planet Blaarg, and took root in a nearby city. The Blaargians noticed their itchy rashes, and the gas itself. Once they had figured out what was going on, being Blaargians, they clambered into spaceships and shot off in a mass panic. The Irkens and other creatures realized the threat and made an attempt to stop the horde of ships, and while many were stopped, many more crashed onto planets. The gas mysteriously disappeared.