Two years on since Monty Halls, his wife Tam and daughters Isla and Molly first travelled to the Galapagos islands, the family head back to discover why it faces a fight for survival. In the opening episode, Monty experiences the mighty volcanic power that created the islands, mum Tam makes a solo voyage in search of threatened giant manta rays, and Molly, the youngest, has her first snorkelling experience.

Monty goes on an expedition to rescue a sea lion. Tam, Isla and Molly investigate marine plastic and learn how tourists can help look after these islands for future generations.

As their stay on the Galapagos draws to a close, Monty and his family find out what's being done to protect the islands and their wildlife from the threat of invasive animals