In an effort to get out of training duties, Adam enlists Leo's help to create a duplicate Adam using Davenport's experimental cloning device. However, Adam's clone uses the same device to create another duplicate to avoid going to school and the clones he creates repeat the same process resulting in a mob of ever duplicating Adams.

When Leo discovers that his nemesis Trent is rattled by a ghostly Halloween legend, he masterminds a plan for Chase and Adam to use their bionics to stage a haunting at the school. In the process the boys come to fear that the ghostly legend may in fact be real.