S1, E5: Carl is sleep-deprived from a recurring nightmare and thus is too tired to be a useful subject for Jimmy's experiments. So Jimmy invents the DreamInjector 5000 and enters Carl's dream to figure out what his friend is so afraid of. Jimmy and Cindy have to collaborate on a science project.  With the help of Carl, Sheen and Libby, they set off in a submarine in search of a famous shipwreck at the bottom of Retroville Bay and Jimmy's mounting frustration inspires mutiny among the "swabees".