A very fun episode that finally sees Katana fighting side by side with Batman. This is probably the best origin of the Bat Signal in any movie or tv show. Also the addition of some new lore is very welcome. The setting of this episode, being the Cauldron, also has a lot of character and is a pleasant change. The guns in this series are really starting to confuse me. What kind of guns are they? Sadly, Phosphorus Rex's design is really lame. This episode worked, and it worked very well.
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