Timeline

The timeline of Zisteau Plays Minecraft is very complex, because the series prominently features time travel and alternate timelines.

The destruction of the Alpha Valley
In episode 11, the Alpha Valley was destroyed by TNT from an unknown source, forcing Zisteau into the Nether. It was restored via a boat tunnel in Episode 18, in the ZO timeline. In the ZH timeline, this didn't work. This happened in Alpha 1.2.

Survival Island
Main article: Survival Island

In episode 24, the valley was flooded, prompting Zisteau to investigate a cave in a cliffside, and his boat falling down a hole, which led to Survival Island. He had to collect all the wool, and then in the ZO timeline, it sent Zisteau home, and in the ZS timeline the island ended up back where it started. The island would continue to be used to enter and exit Sea of Flame. During the scene, the Island teleports to a lava ocean, foreshadowing Sea of Flame. This map was played in Beta 1.3.

Sea of Flame
As the Valley began to dry out, all the grass began to turn yellow, then brown, then black. Zisteau then began to see visions of a lava-filled Alpha Valley. Zisteau decided to see what was up, using the Survival Island, which had gained a time machine and the dog K-9, due to updating to Beta 1.4, sending him to Sea of Flame.

Time travel shenanigans
To exit the Sea of Flame, Zisteau used the Survival Island after spawning it in by placing brown wool in the ZO timeline, which didn't work in the ZF timeline(but there was a sheep that seemed somewhat weird), which sent him into an odd area where there was a grid of islands that began to decay. He used another island, as the original Survival Island began to despawn. He used this, which finally sent him home, to the Alpha Valley. This updated him to Beta 1.5.

This is likely what caused the timeline split.

Upside-Down Kaizo Caverns
More and more of the Alpha Valley began to turn to stone around a fenced pressure plate. Zisteau began to investigate it, as the sun began to turn into a ring. He was then launched into the sun via TNT launcher, which flipped him upside down and landed him in Kaizo Caverns, in Cavern of Sky, updating him to Beta 1.6.

Bedrock
A threat in the Kaizo Caverns setting was the bedrock, which started in an alternate surface Alpha Valley and worked its way through the diamond cavern[name] into Kaizo Caverns.

Canopy Carnage
Canopy Carnage was another map that was connected to Kaizo Caverns by a tree tunnel. It is the source of the wool that was used to complete the Kaizo Caverns victory monument, turning it into a spaceship. This spaceship was used, to blast through the bottom (top) of the area to reach the surface. This succeeded in ZO timeline (updating to Beta 1.7), but failed in ZK timeline.

Chapter Four
Main article: Chapter Four

Prologue
Between episodes 80 and 87, some of the chunks of the Alpha Valley began to rise into the sky. This became much more pronounced in Enumerator and Disjunction, making the Alpha Valley nigh-unrecognizable. Finally, at the end of Disjunction, all the chunks of Alpha Valley rose into the sky, sending Zisteau to Skyblock and updating the game to Beta 1.8.

Infinite Looping
Both the Skyblock and the path-building in Enumerator began to loop during the most recent four episodes of ZPM, where the world was kept in Enumerator and the resources were kept in Skyblock between loops.