- Total blackouts worldwide following mass power outage just a day or two after people count, and it pretty much warms up the viewers of what else is to come.
- Seeing-eye dogs, particularly ones with breeds, fending or trying to fend for themselves. Especially as most of them aren't suitable for such a situation without humans. The thought that our precious friends will become vicious hunters. The notion that animals will forget you and humanity in due time. The fact that the smaller and weaker pets, such as toy breeds, will not survive along with some of the more poorly designed breeds.
- Eventually, given millions of years, there will be no trace of evidence that we humans were ever here, save for perhaps some fossils if we get so lucky. All of our achievements, all of our buildings, all of our records now lost and buried with time. Like we never existed in the first place.
- Seeing your home city being abandoned in the series combines both Nightmare Fuel and Tear Jerker.
- Prypiat, Ukraine. A ghost town which residents evacuated after the Chernobyl disaster. And they just HAD to add creepy child laughter in the background, too...
The Bodies Left Behind
- Mixed with a heavy amount of squick, the eventual decomposition of all human remains in general, particularly those in cryofreeze.
- Atlanta would be overrun with kudzu. However, when the kudzu dries up, it forms a tinderbox. Once lightning strikes, the kudzu ignites and burns down most of Atlanta.
The Capital Threat
- The entirety of Los Angeles being engulfed by a wildfire 10-15 years after people is really unnerving.
- This is topped by an earthquake 50 years after people that makes quick work of most of LA.
- Washington D.C. being flooded.
Bound and Buried
- A San Francisco cable car's cable snaps, sending it careening downhill. It goes so fast that it ploughs through a car.
Sin City Meltdown
- The fate of the Atlantic City Boardwalk. Doesn't help that it's similar to what happened to chunks of the boardwalk in Hurricane Sandy.
- The fucking abandoned amusement park in "Sin City Meltdown". Who knew that the park would have degraded so quickly after only being abandoned in 2002!
Armed and Defenseless
Road to Nowhere
- An oil refinery near Houston explodes just an HOUR after people.
Waters of Death
- The mind-blowingly slow death of a lone caiman in a zoo's water tank. It won't escape, but being a reptile it will take it more than a year to die of hunger, and this wait will be entirely in the dark because the lights will go out long before that.
- Not like the other fish fared any better. Most of them would end up choking to death once oxygen levels go down. The rest would eventually die of starvation. Keep in mind this is within a week after people. Additionally, this is exactly what happened to the aquarium's occupants during Hurricane Katrina. When the staff came back, they could smell the Gulf of Mexico exhibit from outside and nearly all the tanks were filled with decaying aquatic animals.
Wrath of God
- Christ the Redeemer's eventual downfall. Firsly, as the time goes on, the statue's hands plummet on the ground below. Eventually, the statue itself collapses after being covered by plants.
- Actually, the whole episode may be terrifying if you are devoted to God.
- The dead zones around nuclear power plants.
Crypt of Civilization
- The fate of the titular "Crypt of Civilization".
The Last Supper
- Abandoned supermarkets. Especially the meat and deli departments. All that rotting food is the stuff of nightmares...
- In addition to the simulations of rotting supermarkets, the episode features the real-life case of a Forth Worth, Texas grocery store that was abandoned after going bankrupt — with all the food still on the shelves. When the health department entered the building three months later, they found (among other things) jugs of spoiled milk that had literally exploded on the shelves, packages of lunch meat covered in gray slime, and clouds of flies so thick that the cleanup crew (who had to had wear hazmat suits and oxygen tanks) couldn't see more than a few inches in front of their faces.
- Where do most of these vermin come from, you might ask? Why, the FDS allows a certain amount of bugs, rodent hairs, and insect larvae in processed foods. (In fact, it's estimated that the average person unintentionally eats 1-2 pounds of insects this way each year.) Think about that the next time you open a jar of peanut butter or a bag of potato chips.
- The clouds of sugar dust in a refinery igniting violently. We get to see the fireball race along the conveyor belts and catwalks before hitting the silos. Eventually, the fires get so hot that the moisture in the concrete structures turns to steam and the entire plant explodes like a bomb. Worse, it's stated that at least 4 such fires occur in the U.S. every year.
Home Wrecked Home
- The gas explosion in the empty kitchen which happens just a single day after people.
- The San Remo apartments burn down after rags soaked with linseed-oil paint spontaneously combust.
- The collapse of the Burj Khalifa in Dubai.
- Salton City. A once bustling resort town turned into what could best described as "desert with a lot of trash in it".
- The power in Christmas shop going out in the beginning. Unlike previous episodes, where the power grid failures were not given special attention, in this episode, as the power goes out, the Christmas song which had been playing even after people were gone, becomes more and more distorted until it completely fades into obscurity. Also, it happened during the very first day after people, while in other episodes, it took up to several days for power grid to fail completely.
Waves of Devastation
- Just 10 years after people, Sacramento's Folsom Dam will break and the resulting floodwaters would demolish everything in the city.
- Similarly to Sacramento, many cities in the Netherlands would end up flooded within months.
Sky's The Limit
Depths of Destruction
Take Me To Your Leader