The Apple was supposed to be a contestant in Jerma Rumble - Live Action. Only making a small appearance due to a self-elimination.
Jerma Rumble - Live Action Edit
The Apple was supposed to enter the match as the 12th contestant but when Demon Lord Zeraxos began casting his giant spell, he knew he had to interfere to save the Rumble. The Apple managed to sneak up on Zeraxos and pull him backstage to fight him. Moments later, Karl Griffinsteed realized what was going on so he left the Rumble to help The Apple fight Zeraxos. Presumably, this fight is still ongoing and might last an eternity.
The Official Podcast Edit
Jerma gave small bits of information about the actor that portrays the Apple in Jerma Rumble Live Action - a "friend of a friend of a friend" who didn't want to participate in the video, but was forced to play as The Apple anyway, simply because "he was fat".