Intergalactic

 was an American animated science fiction-comedy television series, being created by Eileen O'Reilly. It was produced by Nickelodeon Animation Studios and it aired on Nickelodeon from October 29th, 2001 until December 11th, 2009.

Synopsis
When a geeky scientist finds an alien teenager, they go on wild and odd adventures as she often creates a series of shenanigans to escape from kind of harm.

Main

 * Dr. Henry Yesser (voiced by Dee Bradley Baker) - a geeky human scientist who encounters Crystil and tries to keep her safe.
 * Crystil (voiced by Hynden Walch) - an annoying teenage alien who finds Henry and helps him with several tasks.

Supporting

 * Elle Yesser (voiced by Elizabeth Daily) - Henry's caring wife who serves as the voice of reason for some of Crystil's antics, often treating her like she was a daughter to her.
 * John Thomas Smith (voiced by Kevin Michael Richardson) - Henry's hungry and friendly best friend who knows about Crystil's existence and occasionally decides TBD.
 * Zalbus (voiced by Charlie Schlatter) - a cocky teenage alien who Crystil has a crush on, being rather TBD.
 * Evan Laurens (voiced by Maurice LaMarche) - Henry's workaholic boss who is rather rude towards his employees and wants TBD.
 * Sarah Andrews (voiced by Nika Futterman) - Crystil's nerdy best friend on Earth who likes to play video games and is usually TBD.
 * Austin Morris (voiced by Tom Kenny) - a shy and rather TBD teenager who is TBD.
 * Xiggy (vocal effects by Frank Welker) - an alien cat-rabbit hybrid creature who Crystil found.
 * TBD (voiced by Cristina Pucelli) - TBD
 * TBD (voiced by Richard Steven Horvitz) - TBD
 * Old Man Skips (voiced by Ernest Borgnine) - an old man who is usually TBD.
 * TBD (voiced by Clancy Brown) - TBD
 * TBD (voiced by Lauren Tom) - TBD
 * TBD (voiced by Jay Leno) - TBD
 * TBD (voiced by Jay Leno) - TBD

Antagonists

 * Agent Viper (voiced by John DiMaggio) - a paranoid FBI agent who is obsessed with aliens and often clashes with Henry, suspecting that he might hide a menace to humanity.
 * Ylanzz (voiced by Kimberly Brooks) - a TBD alien huntress who grows an obsession with Henry and TBD.
 * Jake Petrol (voiced by Mark Hamill) - the corrupt CEO of PetrolTech who is very flamboyant and wants to use alien tech to get rich.
 * Betty Claus (voiced by Grey DeLisle) - a mad scientist who is obsessed with being crazy and wants to experiment on Crystil.
 * Agents Hyena Stickler and Maya Fully' (voiced by TBD and TBD, respectively) - two government agents who want to capture Crystil for government purposes.
 * The Scammer (voiced by Charlie Adler) - TBD
 * El Taquito (voiced by Carlos Alazraqui) - a Hispanic criminal who replaces objects with taquitos.
 * Judge Marian Wither (voiced by Carolyn Lawrence) - a rude judge who is TBD.
 * TBD (voiced by Jeffrey Combs) - TBD

Episodes
See List of Intergalactic episodes.

Tropes
See Intergalactic/Tropes.