Ep 20. City of Lost Children

Kara Danvers, also known as Supergirl, finds herself facing a new challenge in season 2 episode 20 entitled "City of Lost Children." After rescuing Mon-El from a spaceship, Kara discovers he has been infected with lead poisoning and she must find a cure before it's too late. Meanwhile, Lena Luthor approaches Kara asking her to investigate a children's hospital that seems to be covering up something.

As Kara navigates through National City, she soon learns that this hospital is not the only place where children are disappearing from. There's a group called the "Child Abduction Unit" that's been secretly kidnapping children with alien powers to use them as weapons. Kara teams up with Maggie Sawyer, a police detective, to stop the kidnappers and rescue the children.

While saving the children, Supergirl encounters a mysterious stranger who helps her in her mission. This stranger has a connection to the abducted children and has been searching for them for a long time. However, the stranger has some secrets of his own and is not entirely trustworthy.

Meanwhile, Lena Luthor is dealing with her own problems as her mother, Lillian, is released from prison and is now trying to take over the family business. Lena's brother, Lex Luthor, left behind a list of Lillian's associates and Lena realizes that some of them are still working with her mother. Lena asks Kara for her help in uncovering her mother's plan and stopping her from taking control of LuthorCorp.

As the episode progresses, it becomes clear that the child kidnappers have a bigger plan in mind. They want to use the children's powers to create a bomb that will destroy National City. With time running out and Mon-El's condition worsening, Supergirl and Maggie must work together to stop the bomb and save the city.

In the end, Supergirl manages to stop the bomb and rescue the abducted children. Lena also succeeds in taking control of LuthorCorp and cutting off her mother's access to the company. However, there are some twists and turns in the episode that leave viewers wondering about the future of certain characters.

Overall, "City of Lost Children" is an action-packed episode of Supergirl that delves into important themes such as family ties, loyalty, and the power of children. The episode leaves viewers on the edge of their seats as they watch Supergirl fight to save Mon-El and the city from the child abductors' dangerous plans.