Ranking the Best Seasons of 'Supergirl'

From the first season on CBS to the later Supergirl seasons on The CW, this list features the best seasons of Supergirl, listed from best to worst with pictures of season posters when available. Fans may debate which season of Supergirl is the best, but each installment of the superhero action series features memorable episodes. Some Supergirl seasons focus on Kara's superpowers and other good seasons reveal insight into her personal life.

This list of Supergirl seasons has been voted on by fans from all over the world, helping to decide once and for all which collection of episodes starring Melissa Benoist, Mehcad Brooks, and Chyler Leigh are the best. Season One introduced viewers to Kara's life in National City while later seasons found Supergirl facing off against Lex Luthor while Kara became close to his sister Lena.

Which Supergirl season is the best? Help us decide by giving your favorite Supergirl season a vote up and please use this factual list to build one just like it to re-rank to fit your opinion.

  • Supergirl - Season 2
    Photo: The CW

    The second season of Supergirl premiered on October 10, 2016, and contains 22 episodes. This season continues to focus on Kara's personal life and professional career as a superhero.

    This season contains several memorable episodes including: "Medusa," "The Adventures of Supergirl" and "The Last Children of Krypton."

    Memorable moments from Season 2 include:

    • Kara and Clark defeat the Metallos.
    • Barry and Cisco ask Kara for help.
    • Kara challenges Rhea to a duel.
    459 votes
  • Supergirl - Season 1
    Photo: The CW

    The first season of Supergirl premiered on October 26, 2015, and contains 20 episodes. This season still focuses on Kara's role as National City's protector.

    This season contains several memorable episodes including: "Pilot," "Stronger Together" and "Childish Things."

    Memorable moments from Season 1 include:

    • Kara shares her secret.
    • Bizarro Supergirl arrives.
    • The team harnesses the power of hope.
    379 votes
  • Supergirl - Season 3
    Photo: The CW

    The third season of Supergirl premiered on October 9, 2017, and contains 23 episodes. This season focuses on stopping threats to National City.

    This season contains several memorable episodes including: "Crisis on Earth-X, Part 1," "Legion of Superheroes" and "Both Sides Now."

    Memorable moments from Season 3 include:

    • Earth-X Nazis invade.
    • Mon-El returns from the future.
    • Supergirl goes to the past to change the future.
    367 votes
  • Supergirl - Season 4
    Photo: The CW

    The fourth season of Supergirl premiered on October 14, 2018, and contains 22 episodes. This season still focuses on Supergirl stopping Lex.

    This season contains several memorable episodes including: "Elseworlds, Part 3," "Blood Memory" and "Fallout."

    Memorable moments from Season 4 include:

    • Supergirl teams up with Superman, The Flash, and Green Arrow.
    • Supergirl battles Red Daughter.
    • The Luthors converge at the White House.
    368 votes
  • Supergirl - Season 6
    Photo: The CW

    The sixth and final season of Supergirl premiered on March 30, 2021, and contains 20 episodes. This season wraps up loose ends - including Lex Luthor, with the help of his sister Lena.

    This season contains several memorable episodes including: "Prom Again," "I Believe in a Thing Called Love" and "Rebirth."

    Memorable moments from Season 6 include:

    • Nia and Brainy time travel back to Kara's home in 2009.
    • Supergirl and team race Nyxly for control of a magical totem.
    • Lena learns she may have her mother's abilities.
    70 votes
  • Supergirl - Season 5
    Photo: The CW

    The fifth season of Supergirl premiered on October 6, 2019, and contains 19 episodes. This season focuses on the bond and mistrust between Lena and Kara.

    This season contains several memorable episodes including: "Crisis on Infinite Earths: Part One," "Blurred Lines" and "Confidence Women."

    Memorable moments from Season 5 include:

    • Lena asks Kara to steal Lex's childhood journal.
    • Flashbacks show how Andrea and Lena met.
    • Four alternate Brainiac-5's suddenly appear.
    215 votes