Invader ZIM - Season 1 - Eps 23: Mysterious Mysteries
When Mysterious Mysteries is having trouble in ratings due to their lack of stories, they decide to take drastic measures and they finally let Dib onto the show. Dib believes this is his best chance to reveal Zim for what he is and he plays a short clip of Zim and Dib in the woods, which actually makes the anchor of the series quite pleased. However, when Zim gets on the show the next day to attempt to prove Dib wrong, they soon get into a battle of words over the real events that occurred on that day as they both attempt to persuade the host of Mysterious Mysteries to believe what they have said.
About Invader ZIM

Title: Invader ZIM
First Air Date: 2001-03-30
Last Air Date: 2006-08-19
Status: Canceled
Rating: 8.429/10 (from 392 votes)
Language: EN
Seasons: 3
Total Episodes: 46
Network: Nickelodeon
Genres: Animation, Sci-Fi & Fantasy, Comedy, Kids
Production Companies: Nickelodeon Animation Studio
Synopsis
Zim dreams of greatness. Unfortunately, though, he's hopelessly inept as a space invader. Desperate to be rid of the annoying Zim, his planet's leaders send him on a mission to infiltrate Earth, providing him with leftover, cobbled-together equipment. To their consternation, Zim succeeds in setting up a base on Earth and infiltrating human culture, posing as a human child as he plots the planet's downfall. Only Zim's archnemesis, Dib, recognizes that Zim is an alien, and of course, nobody believes Dib's claims.
Cast

Richard Steven Horvitz
Zim (voice)

Andy Berman
Dib (voice)

Rosearik Rikki Simons
GIR (voice)

Melissa Fahn
Gaz (voice)

Lucille Bliss
Ms. Bitters (voice)

Rodger Bumpass
Professor Membrane (voice)

Kevin McDonald
Almighty Tallest Purple (voice)