When Roman, with Joan's form dressed as a woman asks Thomas for a Mother's Day gift, Thomas asks him with a British accent "Are you my mommy?", and to that an excited Logan says "'Doctor Who' reference? Fantastic!" "Are you my mommy" is a phrase uttered by the monster of "Empty Child/Doctor Dances" episodes, cited more times in later "Doctor Who" episodes, and "Fantastic!" is the Ninth Doctor's catchphrase.