Review: Transformers #42

The main series continues with a fragile truce, in Transformers #42 from IDW Publishing.

Cybertron is under siege. Carnivorous Insecticlones and rust worms are eating the planet. Exarchon is returned, but Megatron's not giving up without a fight. Against impossible odds, Optimus Prime, Ultra Magnus, and Bumblebee must make an unthinkable choice: Is Cyber…