Graeme falls through the floor of their office and lands in a cave far below. Tim and Bill follow him down and there they find a Tyrannosaurus Rex's jaws, and accidentally lock themselves inside. They are forced to live inside the stomach forever and ever, until they suddenly think of crying for help through the T-Rex's vocal cords. This wakes up the T-Rex and as he yawns, they get out of his mouth and they climb up, only to see the T-Rex eat their house. Written by
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Bill drops a lamp down to Graeme while he is in the hole. The lamp is later shown as working, even though the hole is a prehistoric cave with obviously nowhere to plug it in. See more
[pondering how to get out of the T-rex's innards
I wonder if I could get up its nose?
With the very greatest of ease, I should think! You get up mine, mate!