It is discovered Shaz Wiley died during the fire cliffhanger of series 4, her girlfriend Denny Blood (Alicya Eyo) is determined to get revenge on Snowball Merriman (Nicole Faraday) for setting off the bomb.

Escapee Shell Dockley (Debra Stephenson) is found in Amsterdam by Jim Fenner (Jack Ellis) and other male officers from Larkhall.

Things go from bad to worse for Snowball, with the prisoners refusing to forgive her, constantly heckling, taunting and insulting her at every opportunity and giving her raw food to eat.

Richie's mother Yvonne Atkins (Linda Henry) who hates Snowball later helps her commit suicide.

Sylvia Hollamby's (Helen Fraser) husband Bobby commits suicide leaving her in financial debt.

New prison officer Selena Geeson (Charlotte Lucas) and new inmate Kris Yates (Jennifer Ness) are in a relationship.

Kris is taking the rap for killing her abusive father in order to spare her younger sister, the real culprit.

Fenner's nefarious ways continue when he kills Yvonne as she tries to escape Larkhall, by ensuring that she will be trapped in the "hanging cell", a small room beneath the main prison that is blocked off from the outside world.

The final episode sees the last appearances for Denny, Yvonne, Barbara, Buki and Reverend Henry.

Snowball retrieves her gun from its hiding place at Shaz's memorial and starts to put her escape plan into action, with the unwilling help of Karen.

The Costa Cons, Phyl Oswyn and Bev Tull, arrive at Larkhall with a suitcase full of gin bottles and are immediately disgusted by the squalid conditions on G-Wing.

After being forced to fend off Colin Hedges' advances, Shell threatens to blow the whistle on Fenner and his pimping scheme, a decision which ultimately brings about disaster.

Snowball's suicide note makes some serious allegations against Fenner, which in light of the accusations made against him by Karen and Helen could get him into serious trouble.

Yvonne gives into Kris and makes a bid for freedom by slipping into the cavernous depths of the prison, but Fenner is hot on her heels, intent on sorting her out once and for all, and in the most horrific manner imaginable.