"I guess you always did know me pretty well Henry. Count me in." you say.
"Great! I knew you'd be game."
"Let's get going, I'm ready."

You, Henry and Jack enter his car and drive to some nondescript building. The ground floor resembles just a normal abandoned warehouse, but of course you three enter a secret room with an elevator that takes you to a lab area, then you pass through a gym area where you see quite a few ugly overly muscular humans doing some rigorous training while doing a lot of shouting and yelling A lot of them look like they have severe 'roid rage and that includes the females.

"Huh, sure they all look pretty, but can they fight?" you mockingly ask Henry.
"Well that's what we're going to find out. Now the arena area is through that door, you can just enter and the testing will begin. Jack and I will be watching from an upper room. I'll see you when you're ready."

Henry leaves with the rest of the humans and you're about to enter the arena, but a hand grabs you causing you pull away in a defensive stance. It's Jack.

"Don't fucking touch me Jack!" you growl.
"Sheesh, calm down there, I just have to tell you something. Something important."
"What Jack? I don't have time for your shit."
"Yeah, well you'll be thanking me later. You need to take this." Jack takes a bottle out of his jacket and hands it to you.
"What's this?"
"It's MY invention. Henry hasn't been telling you the entire truth. He's setting you up to be killed. He doesn't have any intention of letting you out that arena until one of his super soldiers kills you, and I guarantee it'll happen eventually. He's already got most of them hopped up to the point of being uncontrollable. He'll probably start increasing the dosage if you start winning against the initial barrage. However if you drink my invention you'll be able to survive. It's just like what Henry's been feeding his Super Soldiers, but without all the side effects. Surely you noticed how ugly and distorted all those subjects were. All he did was make alterations to his original Hyde formula instead creating something new from scratch like I did, yet he claims my invention isn't good enough."
"This all smells like bullshit Jack, but assuming you're telling the truth, why's Henry doing it and why in this way?"
"I dunno, because he's a Mad Scientist, and prone to be dramatic I suppose, its just one of our endearing qualities. Plus we really are testing this shit for the government, so its still good research even if it's doubling as murder. If you want deeper reasons the only other explanation I can give is he's ALWAYS been jealous of you. Yes, it's true he did admire you, but he was always jealous of your natural abilities which he had to get artificially, and even then it wasn't entirely successful as you well know. I can personally vouch for having to hear him rag on you over the years."

This all sounds pretty suspicious especially coming from Jack who's known for his double dealing and sneaky ways. The bottle might contain poison for all you know, or maybe he's just angry at Henry for snubbing his invention and he's using you as a subject to test it which may or may not be as great as he says. Still, Mad Scientist types have tried to fuck you over before; you can't help but wonder if Henry is planning what Jack's claiming.

You don't drink the bottle

"I don't think so Jack. I've never trusted you and I'm not about to start now. You can shove your invention up your ass and give yourself an enema with it, because I ain't drinking the shit."
"Always with the colorful and inventive vocabulary Wolf. (Sigh) Very well, it's your funeral. You'll see." Jack says and walks away.

When you enter the arena area, it's just a big empty white room with another door on the other side of it. High above you can see Henry on an upper floor with a clipboard behind some glass. He waves to you and speaks into a microphone.

"Okay Wolf, we're going to start off slow, this subject hasn't been injected with as much of the formula so I'm guessing you shouldn't have any problems with him. Try not to kill him though, since we DO want some of them to survive!"
"No killing eh? Well I suppose there's a first time for everything, alright Henry send in the victim."

No sooner has the human entered the room, and you've already run up and drop kicked him in the face! You don't allow him to get back up, and end up breaking one of his legs by totally destroying his knee. He's in extreme pain and expresses it vocally.

"Damn Wolf! What the hell!?" Henry shouts.
"Hey you said not to kill him, you didn't say anything about not breaking bones."
"Alright, drag him out, and bring in the next one."

This goes on for the next five fights. The subjects are getting tougher, but so far you haven't had too many problems. You've notice a severe change in the subjects though, mainly being bigger and more vicious, they're starting to not even resemble humans anymore, and in fact they resemble "Mr. Hyde" but even more out of control. You look up where Henry is located and you notice he seems to be laughing and joking with Jack. He addresses you again.

"How are you doing Wolf?"
"I'm a little tired, but I'm okay."
"Okay Wolf, you've been doing well against one opponent, let's see how you do against three."
"Hey, you're supposed to be testing their fighting skills not mine."
"Well you're kicking their asses, so I need to see them at least on equal footing."
"Who are they supposed to be fighting? If they're fighting other humans then you've succeeded, there's no way a normal human can beat those steroid freaks I've been fighting. I don't even think most of the alien races, humans have come in contact with could stand up to them. I'd say your formula is a success."
"Wolf, I'm the scientist here, just a few more tests."
"Fuck that, I'm done. I'm going home and getting some sleep, I'll be taking my money now."

When you try to go out the way you came in, a solid metal door slides from a hidden panel to block your way.

"Don't think so Wolf, we're done when I SAY we are!" Henry then begins to laugh maniacally and when a Mad Scientist does that, well it's never good. And it's really not looking good when three lumbering hulks come through the opposite door all intent on doing you massive harm.

You fight

They're already upon you, so there's nothing else for it, you'll have to fight, but you still have a plan to escape.

As soon as the first hulking freak is trying to bash your head in, you dodge and rake him across the eyes. This earns you a flailing backhand to the wall as it roars in pain, but you've effectively taken him out of the fight. Now the other two attempt to take advantage of you while you try to recover. You narrowly miss a punch that puts a large crack in the wall.

"Goddamn it, kill the fucking mongrel!" Henry screams.

You run up to the blind subject who's still wailing and lumbering around swinging at anything. You jump up on its back and hold on as it tries to grab you. The two other freaks decide to tackle the both of you. As soon as the first one lunges into the blind one with a sickening crunch, you leap from him and on to the back of the second freak and then with all your might leap again through the glass of observation area!

"Sucks to be you Henry!" Jack says and runs off in the corner and takes off his clothing in a vain attempt to hide. Henry doesn't say anything, he just reaches into his lab pocket for something; it's a vial which he fully attempts to drink from.

Not wishing to deal with Mr. Hyde, you quickly knock the vial out of his hand and grab him by the throat. Henry looks helplessly over at the vial which falls to the floor and shatters leaking out all its contents.

"Got any last words before I rip your fucking spine out?"
"Urg. (Choke) Wait! Don't you want to know why? See it from my point of view?"
"Fuck no! Besides Jack tried to warn me before all this shit went down, I thought he was lying though. Looks like you turned out to be the treacherous one. Too bad, I thought you were one of the few alright humans I knew."
"Hold on, we can still work this out, I mean maybe I…"

You silence Henry's pathetic pleas for mercy, with a quick snap to his neck; you don't bother doing anything else, since you don't really feel like wasting any more effort on him. You look down into the arena area where the three subjects have now turned on each other in a spectacularly bloody way. You can still sense someone in the room you're in.

"Jack! I know you're here! I might not be able to see you, but you know damn well I can smell your scent!"
"Hey, calm down Wolf, I did try to warn you!"
"Yeah I know and that's why I'm not trying to kill you too, well that and the fact that I'm too damn tired, maybe later."

Jack quickly changes the subject away from his possible death.

"Well I suppose you'll be wanting your payment. You might as well have it, since you did me a favor by killing Henry anyway. Now I can test my own serum, and I won't have to share the credit with him. There's a briefcase under the table over there."

You go over to pick it up, check it and head home where you collapse on your bed. You'll be feeling the pain from all of this for days.

Still, it beats being a "guest speaker" at a comic convention.