"That was more intense than I thought, I'm more about the theater of it," the "Peter Rabbit" actor confessed.
Corden and Bad Bunny were later joined by WWE superstar Rey Mysterio who gave the host a few pointers on how to make an intimidating entrance when stepping up to the ring.
After practicing a few "mean mugs," James was ready to make his big entrance and made his wrestling debut in a purple mask and matching tights with black flames. He hilariously walked into the ring to Cher's "Believe."
Rey, however, did the comedian dirty and quickly threw him to the mat before promptly pinning him. Watch the hilarious video above!