Subsequently, she went on to co-star in Neighbors 2: Sorority Rising (2016), Flatliners (2017), Hearts Beat Loud (2018), and played Iris West in both Zack Snyder's Justice League (2021) and The Flash (2023).

[2] Early in her career, Clemons co-starred in the Disney Channel series Austin & Ally as Kira Starr.

In 2014, she appeared in Trey Songz's music video for "SmartPhones" and "What's Best for You" in which she played his love interest who catches him in the act of cheating via phone call.

[5] In 2016, Clemons was cast as Iris West in the action film The Flash,[6] but the project was delayed due to the departure of director Rick Famuyiwa.

Despite this, she was still slated to appear in the Justice League film as the same character,[7] but her scenes were ultimately cut from the theatrical release.

[8] In 2017, Clemons co-starred with Callum Turner in the drama The Only Living Boy in New York, and with Elliot Page in the horror remake Flatliners.