First impressions are important, and they set a standard for what fans should expect to see out of a fighter when they finally make their debut in the Octagon.
With the UFC acquiring the WEC roster and adding bantamweight and featherweight fights to their cards in 2011, it has been an important year in establishing the two lightest divisions and making sure they are well received.
Outside of those divisions, there have been plenty of other fighters making their debuts this year that have had memorable performances. The UFC is always looking for the next big heavyweight contender or lightweight title challenger, and they may have got them after seeing certain fighters' debuts this year.
These are the top 10 most memorable debuts of the year in the UFC.