Michael Tiernan

While dirt-biking with Pete, Clark falls into a cave and discovers two hidden treasures: ancient Native American inscriptions that hold the key to his identity and a beautiful girl whom he believes to be his soul mate. Desperate to preserve the writings, Clark pits father against son by enlisting Lex's help in stopping Lionel's construction crew from demolishing the cave.

In part two of the epic crossover event with The Flash, Oliver and Barry Allen (guest star Grant Gustin) take Kendra Saunders (guest star Ciara Renée) and Carter Hall (guest star Falk Henstschel) to a remote location to keep them hidden from Vandal Savage (guest star Casper Crump) while they figure out how to defeat him. Malcolm arranges a meeting between Vandal, the Green Arrow and The Flash that doesn't go as planned. Meanwhile, Felicity, Thea, Diggle and Laurel work with Team Flash to come up with a weapon powerful enough to destroy Vandal Savage.

In its second major crossover event with Arrow, Vandal Savage (guest star CASPER CRUMP) arrives in Central City and sets his sights on Kendra Saunders. After Vandal attacks Kendra and Cisco, they turn to Barry for help. Realizing how dangerous Vandal is, Barry takes Kendra to Star City and asks Oliver and the team to hide her until he can figure out how to stop Vandal. However, things quickly go from bad to worse when a man with wings AKA Hawkman (guest star FALK HENTSCHEL) shows up and flies off with Kendra. Meanwhile, Harrison develops a serum to make Barry run faster and asks Jay to test it out.

A scientist experiments with adding Venusian DNA to his own.

Bennett almost loses his life when the Mountie he is accompanying to Fort Walsh turns out to be an imposter.