With the successful stabilization of the particle stabilizer, why had Dr. Gerrard insisted that it not be taken out for a trial spin? Suspecting a perfidious plot, crafty Dr Charles hatches his own subtle subterfuge! Meanwhile, our harried heroes proceed into the Permian, where getting big bad bugs to buzz off proves a problem! Has Sean met his nemesis? Will Rain and the gang rescue Professor Da Vinci this time? Oh, and why on Earth is Dr. Gerrard so keen to come along?