After Shania brings her dog Cyrus to the junkyard for a DNA experiment, the dog gets lost, so the gang uses forensic investigative techniques to find him in the neighborhood.

Anne is planning a series of experiments with dry ice, but her plans are interrupted by an invitation to Charlie's birthday party. At the costume party, Anne is excited to find dry ice so she can finish her project. Meanwhile, Nick and Shania have to keep Charlie from finding out about Pal when Pal decides to tag along.