James Gunn casting Michael Rosenbaum in Superman reboot has stirred up excitement among fans, but Rosenbaum recently revealed that his participation takes an unexpected form. During a Fan Expo Dallas panel, the Smallville Lex Luthor actor clarified that his involvement in Gunn’s upcoming Superman film is more behind the scenes, focusing on a short but notable voice role.
Michael Rosenbaum’s Cameo in the New Superman Film
Michael Rosenbaum shared that while he is part of the much-anticipated Superman reboot, his contribution is not as a main villain or a prominent on-screen character. Instead, he confirmed that James Gunn approached him for a lighthearted, small voice appearance.
“James asked me to do something fun, so I have a couple of lines that I voice,”
Rosenbaum explained. He further joked about his modest role, saying,
“There was nothing in this one, but he’s the head of DC, so I think he can stick me in a movie or something.”
—Michael Rosenbaum, Actor
The specifics of Rosenbaum’s character remain under wraps, but clues suggest he could be voicing one of the robot companions at Superman’s Fortress of Solitude. This location already features talent like Alan Tudyk and Michael Rooker lending their voices, indicating a playful and creative atmosphere behind these supporting roles.
Rosenbaum’s Longstanding Collaboration with James Gunn
Fans may recognize Rosenbaum’s voice work from his acclaimed portrayal of Wally West’s Flash in the Justice League animated series, as well as his role as Martinex in all three Guardians of the Galaxy films directed by Gunn. This working relationship is rooted in mutual respect and lasting friendship, making Rosenbaum’s return to DC under Gunn’s leadership seem like a natural fit.
Despite the smaller scale of his part in Superman, Rosenbaum remains optimistic about possible future collaborations with Gunn. When questioned about his limited appearance, Rosenbaum recounted,
“Why am I not in Superman? Why am I not in the movie somehow?”
—Michael Rosenbaum, Actor. This points to both humor and a sense of opportunity for more significant roles down the line.
Rosenbaum Reflects on Career Choices and Friendship
Rather than disappointment, Rosenbaum expressed a thoughtful, practical perspective on his career and contributions.
“Whatever comes to me, I look at it, and if it’s not too silly, or if it makes me laugh, or I think I could do a really good job, or I think I can make an impression, I’ll do it.”
—Michael Rosenbaum, Actor. The film’s scheduled release on July 11, 2025, also happens to fall on Rosenbaum’s birthday, making his involvement in the project even more meaningful. The actor acknowledged the depth of his relationship with Gunn, stating,
“He’s one of my best friends, and he’s very loyal. I think he’s got a great vision,”
—Michael Rosenbaum, Actor.
Support from Friends and Future Possibilities
This camaraderie received further endorsement from Tom Welling, who played Clark Kent in Smallville, with a heartfelt nod:
“Once (Michael) gets involved, it’s better.”
—Tom Welling, Actor. Fans of the franchise and longtime followers of Rosenbaum’s career will be curious to see how this brief role might lead to bigger appearances as Gunn continues to shape the future of DC on film.
As anticipation builds for the 2025 release, the inclusion of trusted collaborators like Michael Rosenbaum, Alan Tudyk, and Michael Rooker in James Gunn’s vision hints at a Superman reboot filled with creative energy and potential surprises for devoted fans.
