Taking place after the events of Opposing Force, Adrian Shepherd is saved at the last minute by the enigmatic G-man, and is granted a new lease on life. Spirited away as a teenager in Remnant, he is tasked with protecting the world from a dark and primordial evil that threatens to tear the world apart. And the key to his success lies in 8 teenage kids.

After being held in stasis, Alyx finds herself on a multiverse adventure! On a new planet in a new body she must work with the local resistance and make up for Dr. Robotnik's betrayal! Valve multiverse & Sonic SatAM / IDW comic AU. No sexually explicit content. Blood and guts possible. HL-Alyx spoilers. M for safety. update: notes in chap 1 & more in profile

Demo's family Moves to America, where they adopt a young soldier before he goes insane, A half-life crossover with alternate history elements, this is going to be interesting, ALSO, I'm looking for a co-author anyone interested?

After a Portal Storm sweeps through the entire world, an anomalous event that confused even the Combine, worlds, timelines, and universes are now twisted into the world that is conquered by the Universal Union. People with abilities never seen before on this earth appear. Will they turn the tide into the Rebel's favor? Or will it be another Resonance Cascade?

Gordon Freeman, Alyx Vance, Barney Calhoun, and Adrian Shephard are transported to the world of My Hero Academia. What goofy and wacky shenanigans will they get into?

After the events of Half-life episode 2, Gordon is left to wonder what to do next and Doctor Kliner has the answer for him. It will take him to strange new dimensions in meeting interesting people to warn of the Combine threat, the real question remains is he already too late?

Nina, a prototype, ends up in the quarantine zone of city-17, just as Alyx arrives there as well. Takes place during Half-Life: Alyx. OC WARNING!

Ayita Shephard, Lambda Resistance; Cato'Zorah nar Rayya, hired Quarian of the Council Funded Relay 314 Expedition. Both dissatisfied with their lot in this universe; one under the heel of a Inter-Universal Empire, and the other under the boot of an Apathetic Galactic Council. Together they will change the Galaxy. (Image not Owned, Co-Written with IantheMechanic, First Contact AU)

Gordon arrives at City 17, but something is very much off... [COMPLETE]

Case #9992341 - Statement of Wayne Dalton, regarding his experience playing an experimental VR version of the game Half-Life. (a hlvrai/tma crossover. crossposted on ao3)

The characters are sent to an unknown theater to play Half-Life. Rated M for gore, swearing, and a testicle spider infestation

Deals are made for the one known as Gordon Freeman, yet the one who accepts such deals is none other than the mysterious man himself. When the time comes to accept a job from a dear "Business Partner", there is none other than the one Freeman to do it.

Gordon Wasnt meant to be Transported to another Universe. Gman's Employers wont be happy... Gordon x Ritsuko, This is the New Redux! Rated M for possible Lemon.

Something in life guides everyone. Sometimes it's people, sometimes it's the choices that are made. Chell is on the surface and finds the world is a much different place than the depths of Aperture. Gordon and Alyx are trying to fulfill Eli's dying last wish but that's easier said than done. While at White Forest Barney Calhoun just tries to keep everything from falling apart.

Doctor Strange ends up in an unfamiliar place with powerful cosmic beings. He soon learns that the nature of the multiverse is far greater than anyone can imagine.

Of Ratts and Men sequel. City 17 may be destroyed, but the Combine still reign supreme over Earth. Now, the Half-Life gang must find the Borealis so they can use its portal technology to find Alyx and finally beat the Combine. Luckily, three of the best candidates for the task have just rejoined the surface. Not so luckily, the Combine has found them first. See Ao3 for ch. updates!

A strange visitor visits the city of Columbia looking for new "employees".

When Gordon Freeman accepted the G-Man's deal, he had never expected his next assignment to be placed in another world where humans were hunted down and eaten by giants while backstabbers and undermines plague what remains of humanity. All of it tendering on a world on the verge of collapse and ruin, but the right man in the wrong place can make all the difference in the world.

Benrey goes on vacation while Dr Coomer deals with an angry wizard girl and a school full of entitled jerks. then a man in purple shows up, along with a mystery artist who knows the full history of Dr coomer and his team. Lousie starts questioning Dr Coomer, but Dr Coomer doesn't give a single care in the world. Just what did this man have to do with her?

Following the Black Mesa incident, Gordon Freeman successfully stops the Cascade using the satellite delivery rocket. Years later, Black Mesa is in the middle of an operation where they send agents to other worlds by using purposefully constructed Cascades. One such planet is 4546B, a planet on which they have almost no info. Unexpectedly, humanity finds itself determining fate.

Un fallo imprevisto en el teletransportador de White Forest, envía a Gordon Freeman al universo de Zootopia donde deberá arreglárselas para intentar escapar de la ciudad, sin embargo no lo tendrá nada fácil.

Free from G-Man's grasp and his name forgotten in time, Gordon sets out in The Borealis expecting death. Instead, he is sent to purgatory and made an offer, save another world and get a reward for it, basically. He can do it, after all, he is The Freeman. WARNING, Dumpster fire of a fanfiction and T for blood, violence and swearing.

It's hard for the Ethereals to invade when someone else got there first.

(half-life x re:zero crossover) My take on Re:Zero, but Subaru along with Gordon Freeman are summoned to the parallel world, each through different means. Freeman and Subaru form an alliance to survive in this new world, adventure awaits this pair!

Salvation: Episode II - The Lair of the Shadow Broker - A slight re-imagining of the action packed Mass Effect 2 DLC. After defeating the Reaper threat and surviving the hijacking of the Carmenta Illustria, a dire message from one of Shepard's oldest and dearest friends plunges the team into a treacherous search for the mysterious Shadow Broker. But there are other forces at work..