Okaaaaaaay, um... some guy, who I guess was already some kind of police detective, gets thrown back in time to the 50s or 60s or 70s or something? (WAIT... in the spinoff it's the 80s, isn't it? And the Gene Hunt character is in both... so it must be the 70s. HA, deductive reasoning!) Anyway back in time things are very different and the police follow rules less. And... they have adventures! And since the show ended I guess he got sent back to the future eventually.