Well Carlos from big time rush was on an episode of Ned's Declassified: school survival guide
Episode 3
every episode
they had a Christmas episode in 2010, not 2011
It isn't in an actual episode but rather is part of a Rush concert. It is played before their song Tom Sawyer
episode 8
The second episode if Big Time Rush was called Big Time School of Rocque.
The second episode was "big time school of rocque" and if you want to know all of them in order just google big time rush episode list
In all of all the episodes
No that was Masterpiece the Masters
Big Time Rush was cancelled. Its last episode aired July 25th 2013.
Episode 3
every episode
they had a Christmas episode in 2010, not 2011
It isn't in an actual episode but rather is part of a Rush concert. It is played before their song Tom Sawyer
no
Episode 11: Miracle in Rush Valley
episode 8