What happen at the end?

MAJOR SPOILERS!! Bakula ends up on the inaugural ride of a Los Angeles subway train with a political candidate who is big on ecology. The aliens want to knock off the candidate (who some think is destined for the White House). The aliens have screwed around with sensors in the subway ventilation system with the intention of starting a methane explosion. The formerly good cop, who has been "probed" by the English-accented female doctor (an alien) tries to take over the train, but Bakula has sneaked on to the train as a maintenance guy and eventually overtakes the cop and manages to stop the train with the help of a supervisor in the subway dispatch center. After the politico and his assistant escape from the station where the train stops, the English doctor suddenly appears out of nowhere wearing hot pants, and the cop shoots her, causing a huge explosion. In the confusion, Bakula, Elizabeth Pena, Bakula's kid and Carlos, the dishwasher/cook escape, driving up the Los Angeles aquaduct in their beat-up pickup truck.