All 22 episodes from the fourth season of the adventure drama starring Melissa Benoist as the DC Comics superheroine. Since being sent to Earth as a young girl to protect her cousin Superman, 20-something Kryptonian Kara Zor-El (Benoist) has been keeping her superpowers secret. However, when disaster strikes she has no choice but to become Supergirl, the heroine of National City. In this season, Kara faces rising anti-alien hatred and the villainous Agent Liberty (Sam Witwer). The episodes are: 'American Alien', 'Fallout', 'Man of Steel', 'Ahimsa', 'Parasite Lost', 'Call to Action', 'Rather the Fallen Angel', 'Bunker Hill', 'Elseworlds, Part 3', 'Suspicious Minds', 'Blood Memory', 'Menagerie', 'What's So Funny About Truth, Justice and the American Way?', 'Stand and Deliver', 'O Brother, Where Art Thou?', 'The House of L', 'All About Eve', 'Crime and Punishment', 'American Dreamer', 'Will the Real Miss Tessmacher Please Stand Up?', 'Red Dawn' and 'The Quest for Peace'.