Which CW DC Shared Universe Show Should Be Your First?

List Rules
Fans of the shows only: vote up the CW DC Shared Universe shows that are the best starting point for someone who is totally unfamiliar with the TV universe.

What started as one show about Green Arrow back in 2012 has evolved into a multi-show universe with characters popping up in a number of different places and major series-wide crossovers every year. With all these intertwined shows running for a different number of seasons, it can be confusing for new viewers to know where to jump in on the fun. Sometimes weighing the pros and cons for each series when it comes to the importance to the overall CW Multiverse is the only way to figure out where to start for overall enjoyment.