I just found out yesterday that a Belgian TV channel is still airing Alias (

)
I've missed a whole lot of episode's, so I've got a question regarding which season they air now..and stuff
In the episode from yesterday Syd has to go to these ice caves where she finds a music box.
She got the code for the music box from her mother btw.
After the music was played she destroyed the music box...but then when she turned around Sark was there. (I think his name is Sark

).
Eh, she threw something at him, which resulted in him shooting around. He also shot in the ice, which caused one of those gaps.
Syd fell in it...and now she's trapped under ice.
Whew...thats about it.
Oh, also in this episode Will got hypnotized.
So, my question is:
Which season is this, and what episode?
