Warning: Full spoilers for the episode below.
With a name like “The Martian Chronicles,” Supergirl fans wouldn’t have been out of line in expecting this episode to be the start of a major saga for J’onn J’onzz and M’gann M’orzz. Instead, it was a pretty done-in-one affair, and one that seems to mark the end of M’gann’s presence on the series for the foreseeable future. It’s disappointing the show didn’t devote a little more room to exploring the connection between these two characters, but this episode nonetheless served as a very action-packed and emotionally satisfying farewell to M’gann.
“The Martian Chronicles” could probably be described as a bottle episode, given that it mostly unfolded in a confined location, featured a relatively smaller cast of characters and didn’t really do much to advance the overarching Cadmus conflict. But that description sells it a little short. In terms of action and fight scenes, this was easily one of the more ambitious installments of Season 2 (and, by extension, the series as a whole). There were copious shots of White and Green Martians and plenty of super-powered slugging, flying and wrestling. All of this made for quite the thrilling final showdown, as Winn dodged his way through the chaos to prevent the DEO building from going critical mass and destroying half of downtown National City.
Source:: IGN -Reviews