Water cleanliness and proper sanitation are non-negotiables.

In this one, Ian and Liv take it back to the 1800s, where a public water pump was a vessel of disease for the working class folks of London. Cholera, typhoid fever, dysentery, and a myriad of other bacterial diseases were spreading like wild fire, and it wouldn't be a true 1800's nightmare without the Men in Charge of All the Things (London Chapter) denying the claims of the scientists.

Also, Liv starts a new band. Ian begins panicking over moving in two weeks.

Three balloons walk into a bar.

In this one, Ian is joined by Pete and Carolyn to talk about the balloon massacre, the disastrous 1997 Macy's Thanksgiving Day Parade which resulted in millions of dollars of damage, injuries, and pop culture references that would span decades. How did such a joyous event become so chaotic, dangerous, and memorable?

Also, Carolyn is worried about the children. Pete wishes he were a victim. Ian doesn't understand the concept of capitalism.

You can't skip a step, that's cheating.

In the finale of Ian & Liv's trilogy on the alien cult known as The Order of the Solar Temple, the ill-fated demise of the cult's members is explored. What happens to the cult's leader, Joseph DiMambro? Does anybody escape the cult before death becomes imminent? When do the aliens FINALLY land on Earth? All will be revealed in the next 56 minutes!

Also, Ian celebrates his 34th birthday. Liv decides to become a strict rule-follower.