User blog comment:Blizzardblade/A Night at Zomboss'/@comment-5760976-20150823205504/@comment-26303621-20150823210051

I've had an idea to bring Cactus in. Lightning Reed is only in the game because he's one of my closest friend's favorite plant, so it's a tribute.

Also, they're not robots, since you play as a zombie, the plants have been used as test expriments (where do you think gargantuars came from) and it changed their appearance.