Both "What are Little Girls are Made Of?" and "Dagger of the Mind" involve a famous scientist who turns bad, who traps Kirk and a woman companion with a past love interest deep underground a rotating, consciousness-stealing, evil technology the same sound effects are used to depict the spinning device beaming an unauthorized, mind-washed person aboard the Enterprise. Spock discerns what the problem is by picking up clues from mind-washed individual the ultimate death and destruction of said scientist. Which episode do you like better? Why?