The Secret of Gemino (comic story)

Summary
The Doctor and his grandchildren land on the planet Gemina which has been devastated by a war with its neighbouring planet, Gemino. On meeting the survivors, the Doctor offers to help open the sealed 'Vault of Plenty' where all the planet's food supplies and knowledge are held. The Doctor, John and Gillian have to solve a variety of challenging puzzles and the price of failure is death!

Characters
to be added

Continuity
to be added