The 100 returns for season 4 tonight on The CW, and here's how you can watch it live or after the broadcast.

Season 4 of The 100 begins tonight (Wednesday, Feb. 1) on The CW. The series is back for 13 episodes this time around, and in the season premiere, titled "Echoes," "Clarke (Eliza Taylor) and her friends struggle with how to proceed after the fate of the world is revealed," says The CW. "Paige Turco, Bob Morley, Marie Avgeropoulos, Devon Bostick, Lindsey Morgan, Christopher Larkin, Richard Harmon, Zach McGowan, Isaiah Washington and Henry Ian Cusick also star."

The 100 season 4 premieres at 9 p.m. ET/PT on The CW. If you cannot watch the broadcast live, the episode will be available on The CW website the following day. The last five episodes of season 3 are currently available to stream, if you need to catch up or remind yourself of what happened last.

"In season three, we pick up three months later. The war is over. The battle against Mount Weather has been won," The CW states. "The prisoners have returned home to a world seemingly at peace, but can they find peace within themselves after what they had to do to escape? And is there more to life than just surviving? Unfortunately, their newfound sense of normalcy will be short-lived, and their lives will be changed forever, as threats both old and new test their loyalties, push them past their limits, and make them question what it truly means to be human. First, they fought to survive. Then, they fought for their friends. Now, they will fight for the human race."

To live tweet and follow along with the others watching the season 4 premiere of The 100, use hashtag #The100 on Twitter.