To get the now-childlike Mona onto their team officially, G-Wrench and the team visit league registration. It's revealed that Mona can use a Fight Burst, but doesn't remember how to do it. As Kara's suspicions grow, Professor Pi's team Q.E.D. challenges them to a match.
Here we go! It's Pi's Fight 
Burst, The Final Digit!
ها هي ذي طلقة باي الانفجاريّة 
!القتاليّة، العدد الأخير
Da sehen wir Pis Fight Burst,
The Final Digit!
¡Ahí está, el Fight Burst de Pi,
el Último Dígito!
¡Ahí está, el Fight Burst de Pi,
el Último Dígito!
La voilà ! L’Ignition du Professeur Pi,
le Dernier Théorème !
Ci siamo!
Finalmente! O Fight Burst 
da Pi, o Teorema Absoluto!
А вот и Боевой взрыв Пи,
Финальная теорема!