(Note: Thanks to Ruzie D for the edit.)
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I can't quite describe it but I'll try. It looked like a giant catfish meets a slug meets a whale. It sat in this pool of water. . .or sort of what I thought was water. It had these large, wide black eyes set in the side of its head, like big, shiny bowling balls. I can't tell what color it was; I think dark gray but the weird light made it difficult. It made these rumbling sounds like a loud freight train or a giant snore. Every time it rumbled, the water bubbled, especially around its mouth. There were these large wavy tentacle-like things around its mouth. I think I mentioned it looked kinda like a catfish? When I looked closer I kinda thought I could swear the thing looked ill, like a sad, sick old man. Really, it looked miserable.
Miserable or not, I didn't want to go near it but the aliens had other ideas. They pushed, prodded, and goosed me closer to the thing. I got a sickening idea. "Oh fuck! They're going to feed me to it!" (I was right. . .sort of.)
A couple of aliens came into the chamber. They were wheeling. . .well not wheeling, not when the cart had no wheels. It sort of floated.
The cart carried a large white ball, the size of a Volkswagen. A hose was attached to it, like a fire hose. One end hooked to the ball, the rest rolled around a bar in front. The nozzle looked just like a fire nozzle, complete with handle. The two aliens unspooled the handle and brought it to me. I didn't know what to do at first but then one of the aliens smacked me on the back of my head. I guess it was a hint to take the darn thing.
The big alien stood in front of me and poked my eyes. I blinked, reflex I guess, but the image shifted. This time, instead of see-thru aliens, now I was seeing through the catfish thing. It looked more like some computer generated image than an x-ray, not like with the aliens, and all the images were multicolored. The bones were pale green and the veins and arteries, blue. It had four hearts, colored dark blue; two at its front, one in the middle, and two near its tail.
Its brain looked like a bus-sized cauliflower, going from the front of its head and along the spine. It looked like it had four stomachs, like a cow, connected by tubes. I noticed something strange, even for what I was looking at. Weird red dots were all over, well not all over I guess, all through the creature's body, most of them in the stomachs. The spots were what made the creature sick but I didn't find that out 'til later though.