Evans began his career directing videos at the Upright Citizens Brigade Theatre, including early web episodes of Broad City and It Gets Betterish.[3] In 2012, while working at The Onion, he created The Untitled Web Series That Morgan Evans Is Doing,[4] which was critically acclaimed and named one of the best web series of 2012 by IndieWire.[5] The series was later nominated for a Writers Guild Award.[6]
In 2013, Evans worked as a staff writer for the reboot of Best Week Ever[7][8] and later that year, he joined MTV to write, host, and produce the Teen Wolf After After Show.[9][10] In July 2014, MTV announced they had picked up a second, eight-episode, season of The Untitled Web Series That Morgan Evans Is Doing. For his performance, Evans received a Cynopsis Digital Media award.[11]
In 2022, Evans began writing for the Cartoon Network series Teen Titans Go![12] and wrote Merry Little Batman for Warner Bros. Animation. The film premiered on December 8, 2023 on Amazon Prime Video. Evans focused on exploring the relationship between Bruce Wayne and his son, Damian, in the film.[13] It received a 95% approval rating on Rotten Tomatoes ahead of its release.[14]
In August 2023, Evans' feature film Driftwood was canceled following the Warner Brothers Discovery merger, three months after being greenlit.[15][16]
In September 2024 it was announced that Evans had written and directed the upcoming comedy film Micro Budget starring Bobby Moynihan and Chris Parnell.[17]