This guide will detail every sighting of the G-Man in Opposing Force.

I apologise for some of these screenshots using the HD model, I forgot to turn it off in settings.

This guide contains spoilers.

He can be seen in the tutorial level, just look up to one of the windows in the courtyard.

1st Sighting

Before going up some stairs, look through the door to the right into the lobby. G-Man will be getting annoyed with a Barney.

2nd Sighting

He can then later be seen in the large room where the floor breaks apart. At first, he just observes Shepherd; but then actually saves his life by opening the door.

At the extraction point when you try to leave, G-Man will close the door on Shepherd. Making sure he can’t escape Black Mesa… yet.

While in one of the garbage compactors, look up at the observation window. He will be watching Shepherd's progress.

When you first reach the dam, look to your left at the tower. G-Man will seemingly be talking on a phone before leaving through a portal.

After deactivating the nuke and entering the room with the security guard; look out the window. He will be reactivating the bomb.

Again, G-Man will appear at the end of the game.

Half-Life

Blue Shift

Black Mesa

Half-Life 2

Half-Life 2: Episode One

Half-Life 2: Episode Two