Rosie makes a big decision after Spence starts asking questions about Ernesto's behavior; Zoila learns a disturbing truth about Dr. Neff and tries to warn Genevieve; Jesse clashes with Marisol over her suspicions about Olivia; Evelyn puts Carmen in charge of disciplining her foster son.
A new threat leads Mabel to venture into the enchanted realm of the unicorns. Meanwhile, Dipper learns an unexpected twist about the enigmatic Bill Cipher.
K.C. Cooper enlists the help of former spy and computer engineering expert Simone Deveraux when her family's sophisticated robot, Judy, runs away and is captured by enemy agents.