When Agent Fowler reminds Bulkhead of everything he's been through, the Autobot flashes back to events from Scrapheap, Deus Ex Machina, Out of His Head, Shadowzone, Rock Bottom, Operation: Breakdown, and Loose Cannons.
When Fowler tells him to remember what he's fighting for, Bulkhead recalls experiences with Miko from Darkness Rising (Parts 3 and 4), Metal Attraction, Deus Ex Machina, Rock Bottom, and T.M.I.
Agent Fowler: You left a false trail, huh? I once pulled that trick after I got seperated from my unit behind enemy lines.
Bulkhead: When were you ever behind enemy lines?
Agent Fowler: I wasn't always a bot-sitter.
Bulkhead: Huh. Next you're gonna tell me that your mother doesn't tuck you in bed at night.
Agent Fowler: Not since basic training.
Bulkhead: Training as what? A rodeo clown?
Agent Fowler: You've been spending way too much time at monster truck rallies with Miko. I was an Army Ranger. We could wreck with the best of 'em.
Bulkhead: Who knew you and I were so much alike?
Hardshell: The Wrecker left me alive... the last mistake he will ever make!
Bulkhead: Fowler, how was your beauty sleep?
Agent Fowler: Fine. Dreamt I finally got a little respect from you.
Bulkhead: (scoffs) Keep dreamin'.
Optimus Prime: Rafael and Agent Fowler will be your communications and transportation hub.
Agent Fowler: I can has cheeseburger!
Bulkhead: Communications, huh?
Hardshell: (to the other Insecticons) Divide, and do not hesitate to conquer!
The Tox-En's green coloration, mineral-like composition, and deadliness to Cybertronians are all reminiescent of Kryptonite, the one element that can weaken and eventually kill Superman.