Planet X91 The Sleeping Disease — mark Stewart

In this adventure we read about how Josh must out con Queen Mitta of the Crenoxian empire if he is to be successful in saving not only Florian, but also Clay and all the colonists from the deadly weapon created by the Crenox. Everyone must taste the antidote to the sleeping disease before their time runs out and they die.
To retrieve the antidote, Queen Mitta fails to advise Josh of the deadly corrosive gas covering the plants on a planet directly behind Silux. All they have to do to get the antidote is to think of a way to get past the gas and dig the bulbs out of the ground. Sounds easy, however, the bulbs are under a layer of corrosive and lethal gas.