<Tr> <Th> Directed by </Th> <Td> <Ul> <Li> Dermott Downs (Flash) </Li> <Li> James Bamford (Arrow) </Li> <Li> Gregory Smith (LoT) </Li> </Ul> </Td> </Tr> <Ul> <Li> Dermott Downs (Flash) </Li> <Li> James Bamford (Arrow) </Li> <Li> Gregory Smith (LoT) </Li> </Ul> <Li> Dermott Downs (Flash) </Li> <Li> James Bamford (Arrow) </Li>

What episode is the crossover between flash and supergirl