In a new featurette from The CW, which you can watch above, executive produceers Andrew Kreisberg and Aaron Helbing join visual effects supervisor Armen Kevorkian in explaining the extensive work involved in bringing Gorilla City and its inhabitants to the small screen.
They also show the multiple stages of the VFX, with green screen work morphing into the finished visuals.
Unfortunately, the quartet were quickly imprisoned, and faced death for trespassing in Gorilla City.
A possible way out involved a duel to the death between Barry and the powerful gorilla leader, Solovar.