Yes, there are two Code Lyoko Christmas episodes. Season 2 episode 19 - Cold War and season 4 episode 14 Distant Memory.
You can view all Code Lyoko episodes on YouTube. Simply head to YouTube and type in 'Code Lyoko 28' and it should be the first result (Code Lyoko Episode 28 - Uncharted Territory).
Yumi does not die at any point in Code Lyoko.
the chips are down
He go's to lyoko in episode 65 "Final Round" the last episode of season 3
A Bad Turn episode 39
Code Lyoko Episode 1 : Season 1 : Godzilla
You can view all Code Lyoko episodes on YouTube. Simply head to YouTube and type in 'Code Lyoko 28' and it should be the first result (Code Lyoko Episode 28 - Uncharted Territory).
Yumi does not die at any point in Code Lyoko.
the chips are down
He go's to lyoko in episode 65 "Final Round" the last episode of season 3
Megavideo
Episode # 1 : "Teddygozilla" .
its episode 25 code earth
Teddygodzila
A Bad Turn episode 39
episode 11
Episode 65 - Final Round