Cyber Forces

 is a Japanese-American crossover adventure-science fiction video game series, being co-developed by Sonic Team and Traveller's Tales and co-published by Sega and Warner Bros. Interactive Entertainment since June 13th, 2005.

Synopsis
Set in a sci-fi universe where various worlds are connected and guarded by an elite force known as the Realm Protectors, teenager Melanie Crystal, becomes a rookie agent, being assigned partners in the cat and bird duo Sylvester and Tweety as soon they become one of the only hopes to protect the universe from a dangerous cybernetic threat called the Horde.

Games

 * 1)  (video game) (2005)
 * 2) Realm Protectors Unlimited (2007)
 * 3) Realm Protectors Reawakening (2010)
 * 4) Realm Protectors Forever (2013)
 * 5) Realm Protectors Reckoning (2016)
 * 6) Realm Protectors Infinite (2019)
 * 7) Realm Protectors Undying (2021)

Handheld

 * 1) Realm Protectors Genesis (PlayStation Portable, 2008)
 * 2) Realm Protectors: New Blood (Nintendo DS, 2011)
 * 3) Realm Protectors: The Forgotten War (PlayStation Vita, 2012)
 * 4) Realm Protectors: Lost Secrets (Nintendo 3DS, 2014)
 * 5) Realm Protectors Battle Nexus (Android/iOS, 2018)

Main

 * Melanie Crystal (voiced by Danica McKellar) - an eager yet sometimes idiotic teenager who is a rookie Realm Protector as she attempts to prove herself as a heroine.
 * Sylvester Pussycat and Tweety Bird (both voiced by Joe Alaskey until Forever and Jeff Bergman afterwards) - a cautious cat and a friendly bird who are Melanie's assigned partners as they soon grow a friendly bond with her.

Supporting

 * Granny (voiced by June Foray until Forever and Candi Milo afterwards) - a wise old woman who is an experienced Realm Protector as she now trains Melanie in order to become a better warrior.
 * Leo Andes (voiced by Josh Keaton) - a geeky and nervous member of the Realm Protectors who has a crush on Melanie but can't admit it.
 * Samantha Harkness (voiced by Jessica DiCicco) - a shy and anxious mechanic for the Realm Protectors who has developed the ship that Melanie uses to travel to worlds.
 * Adam Bronson (voiced by Nolan North) - a senior Realm Protector who wants to make sure that Melanie is safe no matter what, not wanting her to go into situations she isn't prepared for.
 * Lena Mosley (voiced by Jennifer Hale) - a giddy and friendly Realm Protector who is known for her friendly and upbeat nature.
 * Matt Rose (voiced by Will Friedle) - a flamboyant yet skilled Realm Protector who enjoys both women and taking down enemies from a distance.
 * The Council, consisting of:
 * Bugs Bunny (also voiced by Joe Alaskey until Forever and Jeff Bergman afterwards) - the official leader of the Realm Protectors who is a wise and slightly mischievous rabbit as he is often extremely busy.
 * Daffy Duck (also voiced by Joe Alaskey until Forever and Jeff Bergman afterwards) - Bugs' egotistical second-in-command who sees himself as one of the greatest Realm Protectors although he is a coward.
 * Porky Pig (voiced by Bob Bergen) - Daffy's sensical best friend who tries to keep his ego under check.
 * Lola Bunny (voiced by Kath Soucie) - Bugs' confident and athletic girlfriend who is an elite member of the Realm Protectors and cares about him.
 * The Tasmanian Devil (voiced by Jim Cummings) - a wild Tasmanian devil who is a Realm Protector and another more famous one.
 * Scooby-Doo (voiced by Frank Welker) - a cowardly dog who is the lovable mascot of Mystery, Inc- and cares about his friends.
 * Shaggy Rogers (voiced by until Genesis and Matthew Lillard afterwards) - an even more cowardly and hungry teenager who is Scooby's owner and a member of Mystery. Inc.
 * Fred Jones (also voiced by Frank Welker) - the leader of Mystery, Inc. who is a lover of traps as he thinks of various traps to capture monsters.
 * Daphne Blake (voiced by Grey Griffin) - a member of Mystery, Inc. who is a massive fashionista, enjoying what she can do with it.
 * Velma Dinkley (voiced by Mindy Cohn until Forever and Kate Micucci afterwards) - the most intelligent member of Mystery, Inc. who usually loses her glasses.
 * Bubbles, Blossom and Buttercup Utonium (voiced by Tara Strong, Cathy Cavadini and Elizabeth Daily, respectively) - a friendly and bubbly, intelligent and slightly controlling and rowdy and arrogant trio of superheroes who often save Townsville from evil and harm.

Antagonists

 * The Horde, consisting of:
 * Lord Eon (voiced by David Kaye) - a terrifying and dangerous mechanical being who rules the Horde as he wants to consume the world into mechanical order.
 * Lady Haywire (also voiced by Tara Strong) - Lord Eon's "daughter" who is the most infamous general of the Horde as she grows an obsession with Melanie and defeating her.
 * Marvin the Martian (also voiced by Joe Alaskey until Forever and by Eric Bauza afterwards) - a martian invader who despises humanity as he gets convinced to be a general of the Horde due to Eon promising that he will destroy Earth for him.
 * Razorsharp (voiced by Charlie Adler) - an insane robotic general of the Horde who has eight razor sharp arms and loves talking about slicing through people.
 * Zero (voiced by Jeff Bennett) - a malicious and calculating member of the Horde who is known for his insane amount of sadism.
 * Lorelei (voiced by Vanessa Marshall) - a seductive yet easily short-tempered member of the Horde who loves to torture people with her two blades.

Common gameplay
The game plays as a third-person shooter platformer as you alongside a few companions travel through various worlds and complete several quests. You start with two guns, one from the Nexus (Realm Protectors HQ) and one from Acme Acres as you soon unlock more by entering new worlds. You are allowed to use several items including healing items and temporary buffs which you can buy or find. You are also allowed to buy upgrades to your weapons which make them way more powerful.

Trivia

 * The release of the series' first installment coincides with Looney Tunes ' 75th anniversary.