Why The Flash Was Chosen for 'The Unbelievable Unreadable Comic Book' Instead of Green Lantern The episode's original choice of Green Lantern was vetoed due to the 'Lanterns' series, leading the writers to select The Flash, which they believe better serves the narrative's dimensional travel elements. The story follows the gang as they seek out the Golden Age Flash in Central City to escape a comic book world, with a deliberate and humorous mismatch in villain placement. The show originally planned to feature Green Lantern in its DC crossover episode, but the character was unavailable due to the upcoming HBO series 'Lanterns'. The writers then decided to use The Flash instead, which they felt was a better fit for the dimension-hopping plot. The episode involves the characters traveling to Central City to find the Golden Age Flash, known for his humorous personality. The team intentionally placed the wrong villain (Mr. Freeze) in the wrong city (Gotham) to create comedy, reflecting the whimsical nature of Golden Age comics. DC's Jim Lee collaborated with the writers to develop these characters for the episode