By they way, are there any particular episodes in the later Supergirl seasons that are good and worth watching? Any Superman appearances in either Arrow or Supergirl? Are those series on one of the streaming services?
They did an annual crossover event between all the series in the Arrowverse. The last one was the Crisis on Infinite Earths which leads into this series. There’s a list of the crossover episodes on the Arrowverse wiki website if you want to see the order they come. They do jump around between all the Arrowverse series so the webpage is the best place to start to find out the order in which you need to watch it.
