The CW has released an extended trailer for the upcoming crossover event between The Flash and Arrow, which among other things reveals that Captain Cold and Heat Wave will make an appearance in the episode.

It gives a good sense for the humor and character moments that will be on display in the crossover, a change of tone from previous trailers which have focused almost exclusively on the action.

You can check it out below.

Part one of the crossover, The Flash episode "Flash vs. Arrow," will debut on The CW tomorrow night at 8 p.m. ET/PT. The second part, Arrow's "The Brave and the Bold," will air Wednesday night at 8 p.m. ET/PT.