Transformers Bunny Farm

1) Strange sightings of transparent giants make Detroit panic in the night of Halloween. Upon investigating, the Autobots see a shadow running around who leaves blue blurrs behind, whispering so fast you can't understand and meet a figure which the humans call "a clawed demon with wings and red-glowing eyes". And then there's the last apparition, a warrior with kind blue optics and a sad smile etched on his face for his friends...

2) Space barnacles have mutated and affect now also humans.

3) Lockdown is back on Earth - and he has set his optics on four special bots: Jazz (fellow ninjabot of Prowl), Ratchet (gave him one of his biggest defeats and is also an escaped prey), Arcee (same as with Ratchet) and Optimus (same as the two before, with new bounty on his head).

4) Prowl is alive again. Unlike Optimus, however, it was a torturous process, making him almost unable to deal with the fact he is alive.
a) Unicorn wanted to devour his spark and Optimus, unwilling to let his friend vanish into complete nonexistence, pulled him back with his own spark.
b) And died instead.

I wonder that I'm the first one for Halloween prompts.

Lockdown does the greatest sacrilege known to Autobots - he steals Prowl's body from his resting place on Cybertron, at that breaking violently into holy ground, because he wants Prowl's mods. Coming to visit his friend, Optimus surprises the bounty hunter at his crime, making him flee through Cybertron's underground to an incinerator. In the end, through a cheap trick of his, Lockdown makes the gangways collapse - and Prowl's body falls down, sinking into the molten slag. He growls at Optimus that because of him, the fragging task of breaking in was for nothing because he has lost now the mods.

a) His anger turns quickly into fear, however, as Optimus not only catches his forearm in attack but crushes it while gripping it in one hand. And that is only the beginning as he slowly, but efficiently punches the bounty hunter up into pieces.

b) Optimus goes berserk at Lockdown, (almost) tearing his arm off while the bounty hunter barely can hold himself against the vicious attacks.