Synopsis: The Doctor and Rose land at what seems like an ordinary animal theme park. Only the Doctor's forgotten to tell Rose that it's not on Earth. Instead it's on a planet entirely given over to being a kind of zoo, and humans are one of the species kept behind bars.
Rose and the Doctor are therefore promptly greeted by staff security and put into the "human area". There, they meet what at first appear to be prehistoric humans. But they turn out to be 41st-century humans that are perfectly happy to dress as cavemen for the benefit of the park's alien visitors. The Doctor discovers that they think of themselves as colonists of this world, rather than its captives. Rose is somewhat disgusted that they're perfectly happy to "dance for their dinner", giving in to their captors' beliefs about how "primitive" humans are.
The situation gets worse when the zookeepers allow other animals—namely dinosaurs—to enter the human's area, merely for the sport of watching humans run.
Realizing the danger of being chased by a T-Rex, the Doctor uses one of them to propel Rose and he into the safety of one of the theme park's visitor vehicles. From there, he's able to manipulate the dinosaurs to break free of the zoo's cages, thereby effectively destroying the safety of the entire operation. The theme park, it seems, will have to be shut down.
The once-captive humans are now forced with a choice. The Doctor offers them passage off the planet, but they instead decide to stay. They came to the planet as colonists, after all, because they thought it was a beautiful world. They still do. Just to be on the safe side, though, the Doctor gives them the business card of some telepathic taxis. "Just think their number," he says, "and they'll be here . . . eventually."
Notes: This story might very well mock some fans' feelings that Russell T. Davies' version of Doctor Who is pushing a so-called "gay agenda". The reference would probably go way over the heads of the kids audience for whom the story was intended, but it is interesting to note that the final panel shows two of the humans, barely clothed, going off into the sunset to start a new life on a new world. As they toast the future of their race, they speak each other's names. The image we are left with is that this brave new offshoot of humanity will come to fruition on this now-Eden-like planet because of the efforts of . . . Adam and Steve.
