"Mumbo-Jumbo's personality should be a parody of her name. Her nature should reflect a little of the darkside of magic. Maybe something that people dismiss. "Why it's purely Mumbo-Jumbo!" However, do they dismiss it through factual knowledge? or because it scares them a little and they'd rather not think about it?"
— Origin of the robot's name
Mumbo-Jumbo was a heavyweight competitor robot which was intended to enter Series 3 of Robot Wars. Although it reached the design stage a chassis being built, it is unknown whether the robot was completed in time - either way, it did not appear in Series 3.
"Oh no!, for series three robots must be finished by the end of May. That's next month. Can I do it? I'll give it a go, but I don't think I can."
— Brain Hepworth
Within a month of the Third Wars auditions, the chassis, which was a vertical three panelled design with the chassis "hanging" in the middle, was built. It used seven channel 40Mzh transmitter and utilised 12V lawn mower motors. The colours were made to stand out and were based on a poison dart frog . It is currently unknown what the weapon would have been.
"12V electric lawn mower motors are going to used so that I can begin to practise driving. (Nine times out of ten, better driving would have prevented contestants from being knocked out.)Talk has now turned to the weapon. Here's were things could start to get really interesting."