This week, the disasters, climaxes, and seasons reach their peak before they Don’t Continue for the summer.  We see the Flash finally return as our Legends wrap up their season, Black Lightning gives us the penultimate episode for its inaugural season.  On Legends, we see everything you’d predict from a season finale.  Flash shows us how different Barry and Ralph are.  Black Lightning sets up our Tobias fight.  Krypton has Seg consider joining terrorists.  Arrow shows us just how much Oliver is screwing up.

[All synopses (and titles) from below the cut.  (If a show’s synopsis is a spoiler to you, do not click More…)]

Lucifer – S03E20 – The Angel of San Bernardino – Returning on April 16, 2018. – Lucifer and Chloe investigate a murder during which a witness claims a winged guardian angel saved her life, causing Lucifer to become paranoid about his own actions. Meanwhile, Pierce and Chloe’s relationship takes an interesting turn and Lucifer discovers something that could change everything.

Supergirl – S03E14 – Schott Through the Heart – Returning on April 16, 2018. – When Winn’s father dies, his estranged mother, Mary, reappears trying to reconnect and to explain why she abandoned him all those years ago. Winn is too embittered from his rough childhood to forgive her but when a copycat Toyman attacks, the two must work together to stop him. Mon-El tells Kara something important about the Worldkillers, and Alex becomes suspicious of Myr’nn’s recent behavior.

DC’s Legends of Tomorrow – S03E18 – The Good, The Bad and The Cuddly – Season Finale – The Legends plan to vanquish Mallus by using the totems doesn’t go as planned, forcing Rip to improvise. The team finds itself regrouping in the Wild West where they run into their old pal Jonah Hex. Sara leaves Ray in charge of watching Damien Darhk, while she comes up with a new plan. Meanwhile, Amaya is determined to find a way to use the totems to destroy Mallus.

The Flash – S04E17 – Null and Annoyed – Barry and Ralph take different approaches to finding the remaining bus metas before DeVoe gets to them. However, Ralph’s cavalier attitude frustrates Barry and the two clash over what it means to be a hero. Meanwhile, Breacher returns to ask Cisco for a favor.

Black Lightning – S01E12 – The Resurrection and the Light: The Book of Pain – Tobias returns to Freeland. He is tasked to capture – not kill – Black Lightning with the help of an unexpected source. After a battle of epic proportions, Anissa and Jennifer provide surprising aid.

Krypton – S01E04 – The Word of Rao – (on Syfy) – Seg is approached by a Black Zero leader as Rao finds a scapegoat for the failed Rankless Initiative.

Arrow – S06E18 – Fundamentals – In his darkest place yet, Oliver wonders if he has failed at everything – being a father, a mayor and a hero. His frustration rising, Oliver lashes out at Felicity and William. A surprising visit from an old friend has Oliver questioning his next move.