A flash clone is a quick, incomplete clone from the fictional Halo world. An embryo is taken and developed a hundred times faster than it would have naturally, becoming something different than it would have been. Many anomalies appear because flash clones are forced to go through time too quickly. Flash clones don't have any muscle memory, no training like natural humans get observing people while growing up. They can be trained with intensive therapy, but after a year or two they start to degenerate from metabolic instability until they die.
