The first season employs a cast of five main voice actors.
Scott Menville provided the voice of
Robin, the Titans' leader and martial arts expert.
Greg Cipes voiced
Beast Boy, a green-skinned
shapeshifter who can change into any animal.
Cyborg, the half-robot half-human technological genius of the Titans, was portrayed by
Khary Payton.
Tara Strong played
Raven, a sorceress from Azarath whose powers are triggered and controlled by her emotions.
Starfire, a Tamaranian princess who still struggles to acclimate to Earth customs, was voiced by
Hynden Walch. Walch also provided the voice for
Blackfire, Starfire's older sister, in the episode "Sisters" while Menville played Robin's alter-ego
Red X in the episode "Masks". In addition to the main cast, the season also employs several guest voice actors. Actor
Dee Bradley Baker provided the voice effects for
Cinderblock, a humanoid concrete monster, appearing in two episodes of the season. Baker also provided the voice of
Plasmus in the episode "Divide and Conquer". The episode "Sisters" featured the voices of
David Sobolov and
Rino Romano respectively as Cron and Kai, members of the Centauri police who came to Earth to capture Blackfire. Veteran actor
Ron Perlman played
Slade, the season's main villain, appearing in six episodes. The episode "Final Exam" featured the vocal talents of
Lauren Tom, who voiced
H.I.V.E. members
Jinx and
Gizmo, and
Kevin Michael Richardson, who provided the voice of
Mammoth. Tom also voiced Gizmo in the episode "Car Trouble". In the episode "Forces of Nature", Stuart Scott Bullock, better known as
S. Scott Bullock, provided the voice of Thunder and
Quinton Flynn provided the voice for Lightning.
Thunder and Lightning are supernatural brothers who use their powers to cause mischief and they would later become allies of the Titans in Season 5. In the episode "The Sum of His Parts",
Tom Kenny, the voice of
SpongeBob SquarePants in the
Nickelodeon series of the same name, provided the voices of Mumbo and robot hermit Fixit, the episode's main villains. Recurring villain Dr. Light, voiced by character actor
Rodger Bumpass (the voice of
Squidward Tentacles) debuted in the episode "Nevermore".
Keith Szarabajka filled the voice of
Trigon, who later returns in Season 4 as the season's main villain, important to that season's story arc.
Tracey Walter lent his voice to the main villain of the episode "Switched",
Puppet King. The episode "Deep Six" featured the vocal talents of
Clancy Brown (voice of
Mr. Krabs) who portrayed the villain Trident, and veteran actor and comedian
Dave Coulier (who played Tramm and Captain), and actor and writer
Wil Wheaton (who voiced fellow hero
Aqualad). The episode "Mad Mod" featured English actor
Malcolm McDowell providing the voice of the titular character. Matt Levin and
James Arnold Taylor provided voices for Cash and Sammy respectively in the episode "Car Trouble". Taylor also provided the voice of the episode's villain Overload. ==Reception and release==