![](https://i.kinja-img.com/gawker-media/image/upload/s---6oxsEGo--/c_fit,fl_progressive,q_80,w_636/b9216c9922cfb5149a59212a052c586c.jpg)
Marc Guggenheim has been involved in the DC television universe for about 10 years. He’s worked on Arrow, The Flash, Supergirl, Batwoman, and Legends of Tomorrow, and was a big part of Crisis on Infinite Earths, the five-hour crossover between a lot of the properties. And now that DC seems to be moving on without him,…