New year cross over

You're referring to the New Year's crossover event!

A New Year's crossover is a special event that takes place on December 31st or January 1st, where multiple TV shows or franchises come together for a special episode or storyline. These crossovers often feature characters from different shows interacting with each other, solving a mystery, or facing a common threat.

Here are some notable New Year's crossovers:

  1. Supernatural and Arrow (2014): The two CW shows came together for a special episode, "What Lies Beneath," where Sam and Dean Winchester (Supernatural) team up with Oliver Queen (Arrow) to take down a demon.
  2. The Flash and Arrow (2015): The CW's superhero shows had a crossover event, "Flash vs. Arrow," where Barry Allen (The Flash) and Oliver Queen (Arrow) faced off against each other before teaming up to take down a villain.
  3. Supernatural and The Vampire Diaries (2016): The CW's supernatural shows came together for a special episode, "Lost and Found," where Sam and Dean Winchester (Supernatural) visited Mystic Falls to help the gang from The Vampire Diaries deal with a supernatural threat.
  4. The Flash and Arrow (2017): The CW's superhero shows had another crossover event, "Invasion!," where Barry Allen (The Flash), Oliver Queen (Arrow), and other heroes from the DC Universe joined forces to take down an alien invasion.

These crossovers often generate a lot of excitement among fans, and they can be a fun way to bring together characters from different shows.