If Declan or Chris are going off world than perhaps the liberation of the little green men, would be possible. To win a war you don’t just resist their attempts to infiltrate your society, you take the war to them on their own ground.
What would happen if a gate was opened under water buy the invaders?
I think there are a few more stories at collage Arcane (Bare in mind I haven’t listened to the compendiums yet).
I also wouldn’t mind seeing advanced Tech being distributed to the good guys, not necessarily Demidova Corp. And of course being stolen by the bad guys.
Hand phasers anyone, fusion power, a true space program, real cloaking technology, and of course Steclan becoming immortal (I am pretty sure Omega is working on it).