For a few months now we’ve been hearing about the upcoming “4-way” crossover that will see Supergirl team up with the heroes from the other DC shows on The CW network. It seems it’s really a 3-way crossover between “Arrow”, “The Flash” and “DC’s Legends of Tomorrow” with Supergirl enlisted to help them fight the invasion by the alien Dominators.
While the crossover will actually kick off at the end of an episode of “Supergirl”, where Cisco and Barry Allen basically enlist Kara’s help, executive producer Marc Guggenheim explains, “Some people call it a four-way crossover because it involves four shows; my ulcer requires me to call it a three-part crossover. The story that’s being told has a beginning, middle, and end: a beginning in Flash, a middle in Arrow, and an end in Legends. But Supergirl is very much a part of the whole thing, so we are crossing over four shows – four shows in three parts.”
So, just how does Supergirl manage to get over to that other universe?
“Last year, Supergirl established that Flash was able to make his way to what I call Earth-CBS,” explains Guggenheim. “It stands to reason that, with the proper breach technology, the reverse can happen.”
As we know, the threat that requires Supergirl’s assistance is the invasion of Earth by an alien race known as The Dominators. In the late 1980s DC Comics published a crossover story titled “Invasion!”, an event which featured a technologically advanced alien race called the Dominators who formed a coalition with various other races to invade Earth and eliminate the threat posed by unpredictable metahumans.
“Once the heroes realize that they’re up against aliens, they decide that they need an alien on their side,” Guggenheim says. “Fortunately, Barry knows a really nice one. I don’t think it’s a big shock that between Barry and Cisco, and all their experiences with Earth-2 and the multi-verse, that they can pluck her from Earth-CBS.”
The CW’s crossover event is expected to kick off in November.