The Sheriff's bailiff is murdered and rumours point to Robin being the culprit. However, he believes it to be a do-gooder known as the night watchman. Robin and the Sheriff form an unholy alliance to find the true identity of the murderer.

Roy is captured by the Sheriff and he is given a choice - kill Robin or watch his mother hang. The Outlaws find a baby in the forest and try to find the parents. Marian defies the Sheriff and he plots her punishment.

When Robin and his gang encounter Flaxton, a farmer, and his son while on their way to Nottingham it doesn't take them long to discover all is not as it seems. When they discover that Flaxton is actually a tax inspector, on his way to count the mountain of tax silver in Nottingham Castle a plan is hatched to allow Robin access to the castle vault.

Returning from a visit to teach the Sheriff's bent pawnbroker a lesson, Robin and his gang encounter another gang of outlaws - just in time to save them from a beating. When their leader turns out to be Alan-A-Dale's brother, Tom, Robin must decide if he should allow the other outlaws to join his gang.

As King Richard's birthday comes around Robin is shocked to discover a terrible secret about Sir Guy of Gisborne. Meanwhile Djaq has been captured and is being held by the Sheriff, with Robin distracted by Gisbourne’s secret can the gang complete a successful rescue without him?

Lambert, a friend of Sir Guy of Gisborne and castle scientist, realises that lives could be at risk if his latest invention were to fall into the Sheriffs hands. When Lambert won't make more of the invention, an "explosive" black powder, he is put into the dungeons by the furious Sheriff. Much volunteers to get himself arrested so he can help Lambert from within, but will he get more then he has bargained for?

Robin saves an arsonist from burning Locksley Church and brings him back to the forest, the gang are reluctant to feel sympathy for him - until they realise who he is and where he's been. Peace is on the table as an emisary from Saladin visits England to negotiate with Prince John, but instead the Sheriff attempts to hold him for ransom. When Robin discovers the plot, he makes plans for the ransom money - but what will he have to face to get it?

When Little John's son is arrested in Locksley, John moves to protect his son from the Sherrif's law - and is quickly thrown in Nottingham's dungeon. Alice is suprised to find her husband is still alive.

The news of King Richard's return to England reaches Robin and the gang - and it means one thing; Marian's marriage to Gisborne is looming closer. Marian attempts to steal Gisborne's money and distribute it to the villagers, Robin tries to find out more about Gisborne's crimes. But then tragedy strikes for the Nightwatchman at Locksley Manor...

In the final episode of the first series, Robin of Locksley mourns the loss of Marian. But in the final fairwells from the group a shocking discovery is made.....