Season 1 of Alexa & Katie premiered on March 23, 2018.

Alexa is battling cancer. But with her best friend, Katie, by her side, she's also starting high school -- and ready for whatever comes next.

Season 2 of Alexa & Katie premiered on December 26, 2018.

For best friends Alexa and Katie, sophomore year brings budding romance, a birthday milestone -- and big lessons they'll never forget.

Season 3 of Alexa & Katie premiered on December 30, 2019.

Junior year is finally here for Alexa and Katie with new relationships, surprising friendships and big decisions on the horizon.

Season 4 of Alexa & Katie premiered on June 13, 2020.

Summer's over, and Alexa and Katie are starting their senior year. They've been through so much together — but there's still more to come.