As we gear up for Series 4 of The Sarah Jane Adventures, the BBC has today issued its press pack which includes full episode details as well as new cast interviews!

Leading lady Elisabeth Sladen promises “new monsters, new protagonists” and a “a great deal of humour”, while Tommy Knight reveals that Luke will be having “a whale of time” in the new series. Daniel Anthony suggests that there might be romance on the cards for Clyde, and Anjli Mohindra shares some of her memories of filming.

There’s also a Q&A with Matt Smith discussing his appearance in Death of the Doctor.

In addition, below are the plot details for each two-parter (minus The Nightmare Man which you can read here). Watch out for spoilers and let us know your thoughts below!

EPISODES 3 & 4: The Vault Of Secrets
PART 1 - When an old enemy, Androvax the Veil, returns to Earth, the gang face a dilemma - should they trust him? Or does the legendary Vault hold an even greater terror? But a second threat arises, when android guardians threaten to destroy anyone who uncovers their secrets.

PART 2 – As the battle between Sarah Jane, Androvax and the androids reaches its climax, Rani has to save her own mother from being caught in the crossfire. But as the Vault opens the destiny of the entire Veil species is at stake. Is it too late to save them?

EPISODES 5 & 6: Death of the Doctor
PART 1 - When the Doctor is declared dead, old companions Sarah Jane and Jo Grant meet for the very first time, and join forces to discover the truth. As an interstellar conspiracy gathers around UNIT HQ, Clyde finds that he holds the fate of the Time Lord in his hand – quite literally!

PART 2 – Old friends fight together to make one last stand against the sinister Shansheeth. But with Clyde and Rani trapped in terrible danger, Sarah Jane and Jo Grant realise their worst fears - their friendship with the Doctor might be the very thing that dooms them.

EPISODES 7 & 8: The Empty Planet
PART 1 - Clyde and Rani wake up one day to discover that they are the only survivors of the human race! The whole of Earth is empty – even Sarah Jane has vanished. But a deserted London holds terrors of its own. Strange forces lurk in the shadows, as mysterious visitors approach!

PART 2 – Clyde and Rani meet their enemy, as the Robots arrive on Earth - but what do they want, and where has the human race gone? It’s a race against time, but without Sarah Jane’s expertise, Clyde and Rani must trust each other like never before if they’re to save the whole world.

EPISODES 9 & 10: Lost in Time
PART 1 - A harmless investigation turns into an epic quest across time and space. Sarah Jane and the gang are separated by the enigmatic Shopkeeper, and find themselves in three different time-zones throughout history - doing battle against ghost hunters, Nazis, Tudors and a mysterious parrot called Captain!

PART 2 – While Sarah Jane tries to prevent a future tragedy, Clyde has to take on the Third Reich single-handed! But Rani discovers to her horror that the march of history cannot be stopped, as a greater danger from the Time Vortex threatens to consume them all.

EPISODES 11 & 12: Goodbye, Sarah Jane Smith
PART 1  - Sarah Jane faces her saddest day, as she realises that no one can defend the Earth forever. She’s saved the world so many times, but must now hand over the task to safer hands. Clyde and Rani are distraught, and the forces of darkness gather as the inevitable day approaches.

PART 2 - Sarah Jane has gone - but a new regime begins at Bannerman Road! Clyde and Rani must face the fact that nothing lasts forever – but can they still unite as a team, to face a new and deadly threat from outer space? Or is the old gang finished for good?

It all begins on CBBC on Monday 11th October. Bookmark our mini-site for the latest!