It is at the beginning of the movie "The Empire Strikes Back"
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The ice planet featured in the movie, Star Wars, Episode V: The Empire Strikes Back, where Luke had to be placed within a warm tauntaun (imaginary pack animal) to be kept alive was HOTH.
C3PO During the escape from Hoth, Han Solo referred to C3PO as the professor.
There isn't going to be a new Star Wars movie.
Assuming that you are talking about the walkers during the Hoth battle, those are AT-AT walkers. They are versions of the AT-TE walkers in the Clone Wars period.
It is the fourth episode of star wars.