Bumblebee is sent by Grimwing to collect energon and kill anyone who might try to stop him. Arcee is forced to do something no Autobot should be forced to do.
Arcee, still in shock from killing Bumblebee, decides to go out for some time alone only to get captured. Meanwhile, Darksteel and Ratchet share a paranormal experience.
Arcee is reunited with her group, and from there they trek to the Autobot weapons cache. Meanwhile, Grimwing has released his latest asset on the hunt.
Everything is beginning to break down. Megatron has returned to unleash his fury, but towards an unsuspecting foe. Also, Optimus banishes Darksteel to enact his mission...Unicron's plan is now at it's peak.