Travis Chase is an agent for Tangent.
He does not to be. He has never officially joined. He possibly is not even getting paid by them. Nevertheless, he works for them as they struggle to keep tenuous control over an accident that happened two decades before and is still threatening the existence of everything.
Chase is a former cop and an ex-con. He had been raised by two not very nice parents who made their living taking what did not belong to them from others. He was himself not a very nice person and he became a police officer largely because it afforded him a chance to keep up with the good guys might be doing against his family and to help further their activities whenever possible. He likely would have remained as such for his entire life if he had not met a lovely young woman who convinced him of a better way. To stop her from stopping him, his parents had her killed. In retaliation and feeling it was the right thing to do, he killed them. And then spent the next 15 years in prison.
As the series begins, Chase is now in his early 40s and wanting nothing from nobody. He has travelled to Alaska and was hiking to really no place in particular when he comes upon a down 747 and sees his entire life change forever.
Break away and back to the event that happened two decades before. As the first particle accelerator is created to find subatomic particles, the inaugural run of the device produces an unforeseen event, a rip in the fabric of existence, something the eggheads who caused it called the Breach. It was a fascinating and mesmerizing tear which, if one stayed too near it too long would cause death or madness. Nothing the scientists did could close it. And after a while, from wherever it led, strange objects came through. These objects were of scientific marvel category doing incredible things far beyond human technology, not all understandable.
It was inevitable that someone somewhere would decide to use the artifacts, known as entities, for their personal gain and to stop that and contain as much as possible the trouble from the Breach itself, the incredibly secret organization called Tangent was created.
One of the main agents for Tangent is the exceptionally resourceful Paige Campbell. Smart, athletic, gutsy, and determined, she is as good an agent as she is beautiful and she is quite beautiful. She has been an agent for some time as the series starts and it is she who shows Chase the ins and outs of dealing with technology that is far beyond anyone's real understanding. Chase, for his part, needs no further lessons in understanding how devious minds work. Together, these two agents and soon-to-lovers have their hands full with enemy agents and alien devices.