This is a brief timeline I summarized according to the events of Entropy Zero 2, original Half-life 2 and its Episodes. Contains a lot of Personal Understandings and guessing.
A Timeline of Entropy: Zero 2
The Event Prior to EZ2
- Advisor sent Recon team including Clone 36 to Arbeit Facility.
- Mossman immediately boards a chopper from Black Mesa East and flew to Arbeit Comms after saving Eli and Gordon, after arrived, did her researches and recorded everything.
It’s not certain the above two events which one happens before another, timeline wise the clone might be down in the Arbeit/Aperture facility for a long time, so we can assume that the main goal of Evil 36 is to recon the Arbeit Comms rather than track down Mossman
Awakening, and the Journey
- Clone team failed and Mossman escaped, both factors combining causing the Advisor activated Main 36.
Between event 1 and 3, Citadel teleporter Blew up
- Gordon was buried, while 36 go through Aperture Tests and Exhumation. Mossman arrives at Arbeit 2 to sent her research to C17 rebels.
According to the Emails of the original Half-life 2 dev team and Episode 1, Gordon was buried for one or two days before Alyx manages to find him. That gives Walker enough time to travel through all these areas and reach Arbeit 2 (As we saw at least a day-night cycle)
- 36 failed to capture Mossman at Arbeit 2 facility, Mossman escaped and transmission was interrupted and intercepted by the Advisor, which ends up in C17 citadel’s database.
- Gordon was found by Alyx and watched the transmission, while 36 made his way to Arbeit 3 and gone after Mossman.
The Final Countdown
- 36 entered Entropic Control, defeated its clone while Gordon and Alyx trying to escape C17
- 36 met with Scar 0, survived Entropic Lift control to anomaly while Gordon and Alyx witnessed the Ruins of Citadel creating a Portal Storm, which spread to the Entropic Lift Control as well.
- Alyx got injured by a Hunter while 36 fighting the Advisor, at this point, Vortigaunts has begun their Advisor hunting and come to help 36.
The reason I stated the Phenomenal happened inside Entropic Lift control is not due to the Anomaly/Borealis is because, although you’re very near the Anomaly, the Portal Storm manifests from where you enter, but not from the Lift which connects to the Anomaly. Which means it happened outside the Arbeit Anomaly Area.
- 36 meets G-man, Gordon finds Antlion Extraction, Vortigaunts started to heal Alyx, giving G-man the opportunity to abandon 36 and went talk to Gordon.
As the previous chapter stated, if the portal storm is manifested from the Citadel, that will explain why G-man will abandon 36 mid-conversation, which also connects the timeline of these two series.