Upon arriving in Kleiner’s Lab after teleporting away from the Depot, Gordon Freeman and Alyx Vance discover they have been stuck in a teleport “loop” for a week’s time.

They find that the teleport caused the destruction of Nova Prospekt, and the blow they struck there was taken as a sign to begin the Uprising.

The two factions have been locked in combat for a week and all of City 17 is a warzone. Freeman goes on to aid in the battle, while Alyx remains in Kleiner’s Lab to help him escape the city.

The player is able to form small squads of citizens to help as they fight their way through the city towards Barney’s location.

Near the end of the chapter, Alyx returns to help Gordon but is captured by Combine soldiers and taken to the Citadel.

---

This is the “ninth a” chapter (designated “9a” in the game) of Half-Life 2. In it, Gordon Freeman meets up with Alyx Vance in the Nova Prospekt train depot.

They discover that Dr. Mossman was actually a Combine spy working on Breen’s side. Together, they search the prison for Eli Vance and Judith Mossman, all the while fighting off security forces. They split up several times, but finally they reunite to track down Mossman.

Alyx plans to use the Combine teleporter to transport her, Gordon, Eli, and Mossman to Dr. Kleiner’s lab, however Mossman manages to trick Alyx, teleporting herself and Eli out of the facility to the Citadel. Alyx and Gordon are forced to take the risk in using the same teleporter to get back to Kleiner’s lab.

As they teleport away, Overwatch Elites are glimpsed for the first time.

---

This is the ninth chapter of Half-Life 2. In this chapter, Gordon Freeman attacks Nova Prospekt, a Combine base, and a former prison, and breaches its defenses with the help of an army of Antlions, with the goal of finding and rescuing the captured Resistance leader, Eli Vance.

This is also the last chapter where Antlions are encountered, because the player soon leaves Antlion territory.

---

This is the eighth chapter of Half-Life 2. It details the second half of Gordon Freeman’s journey to Nova Prospekt.

After crossing through the last part of the coast without the Scout Car, he encounters the first Antlion Guard of the game.

After defeating the Antlion Guard, a Vortigaunt extracts a pheropod from the body, which allows Gordon to control antlions, and trains Gordon in its usage. Gordon then continues along the coast, leading groups of antlions and battling Nova Prospekt guards on his way into the prison.

---

This is the seventh chapter of Half-Life 2. Freeman is informed that Eli Vance has been taken to Nova Prospekt, and sets out on a journey along Highway 17 to rescue him.

The player encounters Combine Soldiers for the first time, as well as a new type of Xen alien, the Antlions.

---

This is the sixth chapter of Half-Life 2. It details Gordon Freeman’s journey through the ghost town of Ravenholm.

Originally a hidden village that lived free from the rule of the Combine, it was discovered and attacked by hundreds of Headcrab Shells, transforming almost the entire population into deadly Zombies.

---

This is the fifth chapter of Half-Life 2. This chapter sees Freeman reaching his destination, Black Mesa East, after a series of chases through the canals.

Gordon meets Dr. Judith Mossman for the first time, and is reunited with a former Black Mesa Scientist and Resistance leader, Eli Vance and Alyx.

---

This chapter details the second half of Dr. Gordon Freeman’s escape from City 17 through its canal system to Black Mesa East.

Aboard an airboat, he fights off numerous Civil Protection units and a Hunter Chopper.

---

This is the third chapter of Half-Life 2. It details the first half of Dr. Gordon Freeman’s journey to Black Mesa East through the City 17 canal network.

In this lengthy chapter, Gordon acquires his first firearm, experiences a lot of combat with Civil Protection forces and encounters alien enemies such as Barnacles, Zombies during the end and Headcrabs for the first time.

---