A Case of the Sing-Alongs - When Mayor Macklemore catches a case of the Sing-A-Longs, Olive and Otto must discover the cause before the Mayor sings his way out of his job! Curriculum: Algebraic thinking; patterns.Ms. O Uh Oh - When a Ms. O from the past shows up at the office, Otto and Oscar must send her back to the day she came from or risk causing a time catastrophe. Curriculum: Measurement; calendar.