this episode explain the origin of curse seal!!!

Juugo:"I don't know when I will want to start killing people again, so lock the door"
or says something like that
Sasuke tells him that he killed Orochimaru
"I will be your cage/prison" he says
Then Juugo starts talking about past times involving Kimimaro
Sasuke says "Kimimaro died for me"
Juugo says "you're Uchiha Sasuke...?"
Some more flashbacks
They continue on for a bit outside of the prison cell
Sasuke" from here on out, we will go about as a team of four"
"and we will refer to our 4-man-team as [snake]"
Naruto says that they should make their 4-man-team and get going as well
Scene change
Sasuke: "of course there is only one purpose for [snake]..."
Naruto"in other words we are targeting..."
in a two-page spread
"Uchiha Itachi"
Itachi says "it might get a little rough" and ends.

Despite Orochimaru having already taken control of nearly 30% of his body, Kabuto takes happiness from that
Naruto goes to grab him, but Kabuto manages to escape
The scene changes to Sasuke versus Tobi and Deidara
Sasuke keeps his cool even within Deidara's attack
Knowing that the C1 wouldn't be much, Deidara creates a huge dragon out of his C2.
It ends with both him and Tobi performing the aforementioned move..."that".
Whatever "that" is will be answered in the week after next next week for us