The Sheriff turns the heat up on Robin and his gang by forcing the Abbot to accuse them of stealing from the church. Tuck's attempt to clear Robin's name ends with him being captured and tied to the rack. Will the gang free Tuck in time, while escaping execution themselves?

Gisborne returns with Prince John's Elite Guards and a secret new weapon. Little John finds himself separated from the others and ends up in a Gladiator circus. Robin finds himself helping a mysterious woman.

Prince John causes mischief when he shows up in Nottingham. Gisborne and the Sheriff are assigned on a royal mission.

Prince John has all the local wells blocked when a heat wave hits the area leaving the outlaws forced to take desperate measures to save those at risk. Robin and Isabella's secret relationship is discovered by Prince John and he orders Gisborne to get rid of them. Robin finds himself having to make a difficult decision.

The Royal Keeper of the Keys and Robin's former mentor, Lord Sheridan announces that King Richard has been killed in battle. Prince John orders a hasty coronation at Nottingham and forces the Archbishop to preside over it. Can Robin unveil a hidden secret before John is crowned King?

Gisborne awaits his execution in a Nottingham dungeon, and meets a fellow prisoner who has a profound effect upon him. Robin thinks he can strike a deal with Sheriff Isabella, but his plans are thwarted when an unexpected stranger from her past arrives, looking for revenge.

It's a step back in time as a mysterious figure forces Robin and Gisborne to hear the story of their past. The truth about their parents is exposed and a huge revelation rocks them both to the core. As the strange figure shows his face, Robin and Gisborne know their lives will never be the same again.

The gang are shocked when Robin announces that Gisbourne is joining their fight against Isabella, but can their uneasy truce survive? Robin and Gisbourne then travel to York to save their half-brother Archer from execution, and find that he has made a formidable enemy in the Sheriff of York.

Robin and his men battle against Isabella as she rounds up men to send to Prince John. Archer works with his sister and attempts to catch Robin and Gisborne.

Robin and his men are forced to retreat after trying to defend the castle. A final battle sees everyone fighting for their lives.