The CW's shared DC Comics universe began with Oliver Queen on Arrow, and Barry Allen of The Flash was introduced on the show before his show was spun off. Characters have crossed over between the two shows before, and a new crossover featuring Barry and Oliver is being heavily promoted by the network.

A new promo has been released for the crossover in New Zealand, showing that Barry isn't able to keep his quips to himself. The promo comes from episode 8 of the current season of The Flash, titled 'Legends of Today'; it will be followed by 'Legends of Yesterday' on Arrow the next night, and obviously references the upcoming Legends of Tomorrow series that will be the next part of the DC TV Universe.

While the version of the clip we viewed doesn't have the best audio, it does feature Barry making a few choice comments to Oliver while on a mission. One scene features a bit of banter between the two about whether Oliver gets cold because his costume lacks sleeves, while another scene shows Barry being a bit sassy when Oliver asks him for suggestions during a fight. It's a short clip, but it does show off some of the fun of putting the two characters together.

This isn't the first time that the two shows have had full crossover episodes, of course. A two-part story occurred last December, first on The Flash with 'Flash vs. Arrow,' and then on Arrow with 'The Brave and the Bold.' This was during season 1 of The Flash, however, so the show was still establishing Barry as a hero and the episodes reflected that. The new crossover comes after Barry has proven himself to be a true hero and faced some major threats, so it's much more of a real team-up between the two shows' heroes than the previous crossover.

The crossover also features villain Vandal Savage, who is set to be the Big Bad in season 1 of Legends of Tomorrow. This will not only provide a major villain for Barry and Oliver to face off against, but will help to establish him as the major threat that he's going to be in the new show. Savage is a major villain in the comics, though he isn't as well known as characters such as Lex Luthor or Joker. It's pretty exciting to see how he's being handled in The CW's shows, since a character of his power definitely deserves more than the villain-of-the-week treatment.

While it's obvious that this crossover's primary purpose is to set up Legends of Tomorrow, it should still be a lot of fun to see the characters sharing screen time. The New Zealand promo does a good job of showing that, making it obvious that even when facing down a powerful supervillain there's still humor to be had. Of course, it remains to be seen just how Oliver will handle Barry's more laid back approach to taking on the bad guys.

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'Legends of Today' is the eighth episode of The Flash season 2 and airs on December 1. 'Legends of Yesterday' is the eighth episode of Arrow season 4 and airs on December 2. Legends of Tomorrow premieres on January 21, 2016.