It is a mishmash of time travel and man versus machine stories that reminds me more of Futurama or 1980s Doctor Who han anything else. But, it isn't the plot that shines here, it is the characters and the comedy. The residents of the NAG (New Above Ground) in season 2 are hilariously wonderful. So many plot twists, and moving from serious and action back to comedy so frequently I don't always know what this show is about, but am well entertained. Worth a watch.