Operation P.O.O.L

==Information==
Summary: Numbuh 4's new pool is actually a portal to an alternate version of the KND Universe where their counterparts know as the DNK (Destructively Nefarious Kids) are evil. The kids do all the adults job whereas the adults sit around and play video games. While swimming in the pool, Lizzie is captured by an evil opposite of herself, Eizzil Enived (Lizzie's name backwards), and Nigel follows the captor back to her home universe. 
*Villain Debuts: Negative Numbuh 4
*Ally Debuts: Destructively Nefarious Kids, LTDFCD, Daddy
*Starring:
**Numbuh 1
**Numbuh 2
**Numbuh 3
**Numbuh 4
**Numbuh 5
**Lizzie Devine
**Eizzil Enived
**Negative Numbuh 1
**Negative Numbuh 2
**Negative Numbuh 3
**Negative Numbuh 4
**Negative Numbuh 5
**Negative Numbuh 86
**Little Traitor Dudes For Children's Defense
**Daddy (Negative Father)
*Cameos:
*Locations:
**Numbuh 4 house
**DNK Treehouse
*2x4 Tech: N/A
*Villain Technology:
**S.P.L.A.T.T.L.E. (Smart-alecky Prisoner-Lobotomizing Apparatus Terrifyingly Tortures Loser Enemy)
==Trivia==
*First appearence of Lizzie in a swimsuit.
*This episode is somewhat based off the Star Trek episode entitled "Mirror, Mirror", where the crew of the Enterprise encounter their own evil twins. The Evil Spock had a goatee like Negative Numbuh 4's, which denotes evil twin status.
*The second episode to use the word "pool", the first was No P in the OOL.
*Everything is completely opposite of the real world, both of the organizations and the characters' personalities. For example, the KND are evil, and the DCFDTL and Father are good. Their names also seem to be reversed in spelling (Lizzie's counterpart's name is Eizzil)
*Numbuh 4 finally learns to swim in this episode.
*Numbuh 3's feelings towards Numbuh 4 is briefly shown when Negative Numbuh 3 tells Numbuh 4 that she doesn't like him. Since she's Numbuh 3's negative, Numbuh 3 must actually like Numbuh 4. Whether this is in a romantical way or not is unknown.
*At the end of the episode, before Numbuh 1 and Lizzie leave the negative world, Numbuh 1 notices Ezzil's eyes aren't evil anymore, and flirts a bit with her. Lizzie notices and rips him away from her nega-self and throws him in the pool.
*When Negative Numbuh 4 is jumping off of the diving board to go to the positive world, it doesnt show Positive Numbuh 4 on the diving board when he was there less than 2 seconds before he jumped.