Lily has been having recurring nightmares and neither of them understand her descriptions. Upon getting a description of Trashy and Tentacle, Lisa invents a dream machine in order to enter Lily's dream where she brings Lincoln, Lynn, Lola, and Leni a... (more)long for the ride while having them use the return button if it becomes difficult. After Lisa's Lull-a-Bot helps them into Lily's dream, Lisa, Lincoln, Lynn, Lola, and Leni search for the nightmares plaguing Lily. Meanwhile, the rest of the family work to keep Lily from waking up while everyone is in Lily's dream.