Unaware their paths are about to cross, Matt Murdock, Jessica Jones, Luke Cage and Danny Rand investigate criminals and fight injustice.
While a new conspiracy comes forms, Matt has trouble with old habits, Jessica gets in over her head, Luke tracks a lead and Danny meets his match.
Elektra's secrets are revealed; Danny changes his tactics; Matt gives Jessica some legal advice; Luke searches for the White Hat.
As the Defenders get to know each other over dinner, they're interrupted by some unfriendly party crashers.
Elektra's loyalties are questioned; Colleen collides with an old acquaintance; Luke proves that he can take a hit.
Stick provides a theory; Danny finds himself sidelined; Alexandra learns that it's not easy being the leader.
Matt, Jessica and Luke head out on a desperate search; Colleen and Claire debate heroism; Elektra tries to recruit an important ally.
As New York edges closer to disaster, Elektra sees what's beyond the wall; the Defenders make a last-ditch effort to save the city.