Presenting the Disney version of the Half-Life story: Shockley, the Littlest Houndeye.
I'm pretty sure little Shockley would wind up in Black Mesa because he and his pack got chased into a cave in Xen by the evil Nihilanth's army of Vat Trooper robots. Because it doesn't count as killing if you're killing robots. Anyway, the pack would be running for their lives and Shockley the Littlest Houndeye would trip and fall trying to keep up with the pack when they ran up the stairs, and the Vat Trooper robots would miss him or ignore him because he landed in an adorably crumpled heap and they thought he was dead already. This would be the equivalent of the barracuda attack on Nemo's unhatched brothers and sisters.
He'd get up eventually and start trying to find his pack, and he'd have to wander through this huge scary place and hide from monsters. But he'd find the Man in the Orange Suit in the middle of a fight with the Vat Trooper robots. Then he'd be scared because let's face it, that's all scary stuff, but the Man in the Orange Suit wouldn't kill him because maybe Shockley got up enough nerve to sonic-bark the last robot into falling apart when it got up to try and get off one more attack. And then the Man in the Orange Suit would patch him up because he was hurting. Then there'd be a sequence of 'we're even, go away, I don't need to deal with you any more', but Shockley would try to find him again. Only he wouldn't manage it because he'd almost catch up with him only to find himself right at the edge of this huge drop.
He'd be a sad little houndeye then and go wandering off sadly, and that's when he'd run into the humans who look and act sort of like the Vat Trooper robots, and he'd be scared of them too. But that's when he'd find where his whole pack was being held prisoner! So he'd go to try and find the Man in the Orange Suit again because maybe he could help, and he'd see that the humans were fighting those mean ol' robots. And he'd be very brave and get in the fight himself, but he'd get hurt and the humans would start losing and the Man in the Orange Suit would show up and then they'd start shouting and it would be scary. But Shockley would come limping out and nuzzle them on both sides (licking their hands would be kind of hard) and they'd sort of growl at each other instead of shooting.
And then they'd start talking and somebody would realize there was a TREMENDOUS blue monster on the way and OH NO WHAT DO WE DO. Shockley would then lead the Man in the Orange Suit and one of the scary humans to set his pack free, and they'd find a whole ROOM full of shiny tau cannons (because energy guns aren't as bad as guns that shoot bullets), and they'd take them and the humans would work together with the WHOLE PACK to bring down the awful blue monster. And it would be just like fighting Maleficent the dragon. They'd even chase it into that big drop so it would fall out of sight and not actually die on screen.
Then the humans would shake hands and it would be okay, but Shockley's pack would be really scared and unhappy because the evil Nihilanth had sent the blue monster and they couldn't ever go home while the Nihilanth was there, so the humans would offer to come help, and that's how Shockley and his pack and the Marines and the Man in the Orange Suit would all go to Xen together and make it to the evil Nihilanth's chamber. Most of the Marines would be busy shutting down the Vat Trooper factory so the robots would all go off line. And to destroy him and end his evil forever they'd have to blow up the spikes in his secret chamber, so the head Marine, who would probably be Adrian, would get one spike, and the Man in the Orange Suit would get another, and Shockley would have to destroy the last one. And then everybody would go home and be very happy and Shockley and his pack would all celebrate and it would be great.
Half-Life 2 would begin when Shockley's pack's territory got trampled by a Gonarch running away from weird new monsters, only to get captured and hauled away. Shockley would follow it to find out what was going on, and that's how he'd discover the Citadel... but that's a story for another time.
ETA: Actually, maybe Shockley ought to be a girl. You know. For spunkiness. And gender equity. It's not like Shockley's got genitalia or anything, just hire a ten year old voice actress and nobody'll ever know the difference.
ETA 2: That or Shockley picks up a female buddy early on in the form of Hedy the headcrab.
I'm pretty sure little Shockley would wind up in Black Mesa because he and his pack got chased into a cave in Xen by the evil Nihilanth's army of Vat Trooper robots. Because it doesn't count as killing if you're killing robots. Anyway, the pack would be running for their lives and Shockley the Littlest Houndeye would trip and fall trying to keep up with the pack when they ran up the stairs, and the Vat Trooper robots would miss him or ignore him because he landed in an adorably crumpled heap and they thought he was dead already. This would be the equivalent of the barracuda attack on Nemo's unhatched brothers and sisters.
He'd get up eventually and start trying to find his pack, and he'd have to wander through this huge scary place and hide from monsters. But he'd find the Man in the Orange Suit in the middle of a fight with the Vat Trooper robots. Then he'd be scared because let's face it, that's all scary stuff, but the Man in the Orange Suit wouldn't kill him because maybe Shockley got up enough nerve to sonic-bark the last robot into falling apart when it got up to try and get off one more attack. And then the Man in the Orange Suit would patch him up because he was hurting. Then there'd be a sequence of 'we're even, go away, I don't need to deal with you any more', but Shockley would try to find him again. Only he wouldn't manage it because he'd almost catch up with him only to find himself right at the edge of this huge drop.
He'd be a sad little houndeye then and go wandering off sadly, and that's when he'd run into the humans who look and act sort of like the Vat Trooper robots, and he'd be scared of them too. But that's when he'd find where his whole pack was being held prisoner! So he'd go to try and find the Man in the Orange Suit again because maybe he could help, and he'd see that the humans were fighting those mean ol' robots. And he'd be very brave and get in the fight himself, but he'd get hurt and the humans would start losing and the Man in the Orange Suit would show up and then they'd start shouting and it would be scary. But Shockley would come limping out and nuzzle them on both sides (licking their hands would be kind of hard) and they'd sort of growl at each other instead of shooting.
And then they'd start talking and somebody would realize there was a TREMENDOUS blue monster on the way and OH NO WHAT DO WE DO. Shockley would then lead the Man in the Orange Suit and one of the scary humans to set his pack free, and they'd find a whole ROOM full of shiny tau cannons (because energy guns aren't as bad as guns that shoot bullets), and they'd take them and the humans would work together with the WHOLE PACK to bring down the awful blue monster. And it would be just like fighting Maleficent the dragon. They'd even chase it into that big drop so it would fall out of sight and not actually die on screen.
Then the humans would shake hands and it would be okay, but Shockley's pack would be really scared and unhappy because the evil Nihilanth had sent the blue monster and they couldn't ever go home while the Nihilanth was there, so the humans would offer to come help, and that's how Shockley and his pack and the Marines and the Man in the Orange Suit would all go to Xen together and make it to the evil Nihilanth's chamber. Most of the Marines would be busy shutting down the Vat Trooper factory so the robots would all go off line. And to destroy him and end his evil forever they'd have to blow up the spikes in his secret chamber, so the head Marine, who would probably be Adrian, would get one spike, and the Man in the Orange Suit would get another, and Shockley would have to destroy the last one. And then everybody would go home and be very happy and Shockley and his pack would all celebrate and it would be great.
Half-Life 2 would begin when Shockley's pack's territory got trampled by a Gonarch running away from weird new monsters, only to get captured and hauled away. Shockley would follow it to find out what was going on, and that's how he'd discover the Citadel... but that's a story for another time.
ETA: Actually, maybe Shockley ought to be a girl. You know. For spunkiness. And gender equity. It's not like Shockley's got genitalia or anything, just hire a ten year old voice actress and nobody'll ever know the difference.
ETA 2: That or Shockley picks up a female buddy early on in the form of Hedy the headcrab.