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X was a mysterious and anonymous person who stole the Crystal of Knowledge from Tess Mercer, and then presumably mailed it to the Kent Farm as part of a scheme that sent Clark and Lois into the Phantom Zone.
- X's identity was never revealed on the show.
- Writer and producer Al Septien revealed that X was Lex in a twitter post: "As Lex ("X") recovered, his people stole it from Tess and he sent it to Clark hoping it would finish him by sending him to PZ."  However, it's unclear how Lex's team was able to reprogram the Crystal of Knowledge, a highly advanced piece of Kryptonian technology, to send someone into the Phantom Zone.