This episode is a sidestory!  Gintama has been involved in many (one-sided) crossovers.  This time, they're working with the Jump comedy manga Sket Dance!  An episodic anime that airs on Thursdays at 6 PM about a group of three odd jobbers with plenty of laughs and tears...  Sounds very similar to Gintama.  As Gintoki warns that the Sket Dan is coming after Gintama, the Sket Dan members appear and offer a challenge!
We get in the first word since our 
side of the crossover airs earlier.
Tenemos la primera palabra ya que nuestro lado del crossover salió al aire primero.
A gente teve a palavra final, já que o 
nosso lado do crossover vai ao ar antes.