The Wheelman resembles a giant, emaciated corpse fused with a wheelchair and life-support machinery. The underside of the ribcage/stomach area is largely exposed and has numerous tubes and machinery plugged into it. It also has plentiful segments of wire and metal fused into its body. Its face is completely mutilated into a pulpy mass, with a horribly tumor-like growth on one half of its face and a single skinned eye on the other half. It has skinny, atrophied legs which seem to be tied to its wheelchair and can only be seen when it writhes in pain. Huge tanks of blood surround its environment, as well as clear fluids and gigantic air-pumps.The Wheelman is a massive creature, and you have no way of confronting it directly. In order to damage it, you must forcefully remove all four of the huge life support hoses attached to the scaffolding around it. If you try to remove them without first distracting the Wheelman, then he'll interrupt you by violently slamming its fist down on you.
The Wheelman has a few methods of attack, other than the aforementioned fist slams. It seems to have telekinetic powers, as it creates distortions in the air and gathers loose debris in a cluster before hurling it at your current location. A shotgun blast will disrupt it and cause it to drop its current collection, however. It also rips open cells to free other monsters should you retreat out of its sight. Its last, although seemingly unintentional, attack is to summon forth huge bolts of lightning on your location when it starts raining. While it does this it flails and sparks, obviously being shocked violently by its life support during the downpour