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Endym was the Interplanetary Cultures Professor at the Lorien Academy. He taught Sandor before his expulsion from the Academy.

Endym is spotted at The Chimæra by Sandor, who subsequently hides from his teacher because of the fact that he is under-age and out with no hope of getting to school on time. Sandor describes him as a pretty cool guy and the only teacher that he likes but he knows, despite this, Sandor knows that if Endym catches him he would have no choice but to report him.

Endym eventually catches Sandor as he tries to leave and he is subsequently expelled from the Academy.

Endym would have been killed during the Invasion of Lorien by the Mogadorians.