In the second annual crossover, an immortal man named Vandal Savage hunts down Hawkman and Hawkgirl. Barry and the rest of Team Flash team up with Team Arrow. Heroes Join Forces is my least favorite crossover, but that is Arrow Season 4's episode "Legends of Yesterday". This episode, on the other hand, is the definition of fun! It has a lot of fun crossover moments you could ask for. These crossovers are meant to just be fun and this nails that perfectly! I just love Legends of Today so much, it's almost a 9/10, but ultimately, it's just an 8.5/10 in my opinion! Great! I recommend you watch if you're looking for a good time! Going under Flash of Two Worlds.