The Flash: 10 Best Characters Who Only Appeared In One Episode

Crisis on Earth-X is one of the Arrowverse's finest crossovers, and represents the franchise at its creative peak. It deftly balanced a large number of characters and storylines, offered emotionally resonant moments and solid action set pieces.

One side character who shone during this crossover was Raymond Terill/The Ray. Once a resident of Earth-1, Ray was empowered by his dying Earth-X counterpart after the latter escaped from the dystopian reality.

After receiving his abilities, the young hero-to-be began learning how to use his great abilities, as well as manage the demands of his personal life. This came to an end when he travelled to Earth-X and was subsequently imprisoned in a concentration camp for his sexuality and relationship with Leo Snart/Citizen Cold.

There, he met various Earth-1 heroes such as the Flash, with whom he briefly teamed up with to stop a corrupted Red Tornado. Later, he and the Earth-1 heroes travelled to their original reality to stop the Nazi regime from conquering that reality as they did with Earth X.