Jack wakes up in a dark place. He senses that all of his bodies and possessions are nearby. ((I'm assuming he'd probably be in the human body.)) A bit of exploration reveals that he is inside some sort of underground-river eroded cave system.

As he checks this world's biases, it seems as if everything is well within do-ability range. Nothing seems particularly easy or difficult.

If he checks with the Sphere-body's sensors, he is able to obtain a full map of the region, including the entire cave system he is in, as well as the surrounding area. This particular cave system has only one open exit to the surface which is at the top of a very long cleft in the stone that extends to the top of a mountain above. It would be very difficult but not impossible to climb out, and he would exit on top of a plateau which is practically inaccessible without flight or exceptionally skilled sheer cliff climbing abilities to anyone on the surface. The other passable exit is the river below him down a few winding cave passages, which would require being under water for about 1 hour and exits near the bottom of a lake at the base of the mountain. There are a number of other passageways that come within meters of the surface, but are blocked by fallen debris from the mountain. He could get out of them, but they would be inaccessible to anyone without boulder-moving equipment.

There is a settlement nearby on the surface, which is populated by monkey-like humanoids who are about knee-high for Jack.

If he puts all of his extra bodies in his Tardis hat, and leaves via one of the debris blocked passages (clearing the debris with his robotic body first) he could easily find his way to the settlement. It is a stone-age tribe. About 5 miles from the village, he would be observed by one of the people from a distance, and when he found the village, most of them would hide until they knew if he could be trusted. The one who had followed him would be the first to make himself visible. Although Jack wouldn't recognize their language, his Order Translate power would automatically tell him that the person said, "Hello, giant, what do you want?"