In the guide to "Daydreaming" (#1.11), Ned has an espionage daydream, during which Cosmo and Wanda from The Fairly OddParents (2001) appear. Daran Norris (Gordy) provides the voice for Dad and Cosmo on the series.
The appearance of Cosmo and Wanda in this episode is not only a funny left-field gag, but also has some interesting connections. The actor for Gordy, Daran Norris, voices both Cosmo and Timmy's Dad on the show, and Ned's Declassified creator, Scott Fellows, also worked on the show as a writer from season two up to season seven.