Marvel's The Defenders - Season 1, Episode 3: Soundtracks

(Flashback) Elektra chooses her weapon then begin training; training montage; Alexandra gives Elektra an outfit and tells her it represents who she is - The Black Sky.

After Jessica leaves the Raymonds home, she realizes that Matt is following her and uses her PI smarts and powers to turn the game on him and starts following him instead.

Danny is overcome by the Hand masquerading as Midland Circle executive when Luke arives to give him a hand; Luke and Danny fight the Hand; Jessica and Matt meet at the penthouse to join the fight.

The Defenders see Elektra coming and end up in a hallway fight with her and the Hand.