4. Season 3
The first half of Supergirl‘s third season had shades of other American TV dramas and it wore that persona surprisingly well. There was a maturity to its storylines, with Kara’s PTSD over losing Mon-El, Alex’s moving struggles over choosing between her relationship and her desire to be a mom and Lena Luthor’s corporate battle with Morgan Edge all making for an incredibly compelling opening. And that was taken many steps further when Reign was born, with the Worldkiller’s midseason finale showdown with Kara producing one of the show’s most captivating – and terrifying – moments.
The second half of the season tried hard to capitalize on that momentum, but it couldn’t quite get it right. Sam’s internal battle with Reign over control of her own body was a gripping arc and it gave what is probably the show’s best supernatural villain a real emotional hook to her story.
Unfortunately, the show just spent too long trying to fix Sam, dragging things to a standstill for episodes on end before then solving the problem too soon and having to take us on a retread in order to finally conclude the story.
There was too much momentum in the Reign story for it to fail completely – and Odette Annable was speculacular as both Sam Arias and the Kryptonian villain – so that definitely didn’t happen, but too many episodes ended up diluting what could have been the show’s best season to date.