Batman Beyond/Trivia

• Hey, It's That Voice!: Seth Green as Nelson Nash, Carey Elwes as Paxton Powers, Patton Oswalt as Eldon Michaels in "Sentries of the Last Cosmos"...
  • "Return of the Joker" has Melissa Joan Hart as Dee-Dee, Henry Rollins as Bonk, Abbie Carmichael as Barbara Gordon, The Flash/Lex Luthor as Ghoul, Megatron as Woof and Ace, and Al Calavicci/Number One/John Cavil as Tim Drake.
  • And George Takei as Mr. Fixx in the two-part first episode.
  • J'onn J'onzz is Stalker.
  • William H. Macy is the obsessed Inque fanboy, and Andy Dick is Slim in "The Eggbaby".
  • Henry Rollins as Mad Stan.
  • Linda Hamilton voiced Dr. Lake, the scientist who gave Mr. Freeze a new body.
  • John Ritter is the evil brain-washing Dr. Wheeler in "The Last Resort".
  • Randall Weems is Matt McGinnis
  • The supervisor of Inque's prison is the narrator in Clerks the Animated Series.
  • Terra voices Inque's daughter.
  • The grandson from "Lost Soul" is Shawn Hunter from Boy Meets World, which Will Friedle shared top billing in.
• Hilarious in Hindsight: A Batman musical? Thrown in as a joke in the episode Out of the Past, as one was being considered at the time. Fast-forward several years to a new Batman series...
• I Knew It!: Some fans had speculated that Terry and Matt's parents were divorced because the boys both look nothing like their father (they have black hair, compared with Mary who is a redhead and Warren whose hair is light brown - genetically improbable). Flash forward to the Justice League Unlimited episode Epilogue which doubles as a Fully-Absorbed Finale, and guess what? CADMUS had Warren's genetic material overwritten with Bruce Wayne's, making him the boys' biological father. According to the series' staff, this decision was a Sure Why Not motivated by the realization of said genetic improbability. But fans were wrong about Terry's mom having an affair.
• I Want You to Meet An Old Friend of Mine: Wil Friedle, who plays the main hero Terry, is best friends with Jason Marsden in real life, who played guest character Donny Grasso in "Hooked Up". The two actors have worked with each other in a number of other shows as well.
• The Other Darrin:
  • Barbara Gordon was voiced by Stockard Channing in Seasons 1 and 2, but was replaced by Angie Harmon for Return of the Joker and Season 3. This would not be a first for the DCAU Barbara Gordon, as she did undergo this trope twice in her Batgirl days, too.
  • Queen underwent this, too (having been voiced by Amanda Donohoe in her first appearance, then by Sarah Douglas in her other appearances), as did Paxton Powers (Cary Elwes, then Parker Stevenson), and Jack (Scott Cleverdon, then Nicolas Guest).
  • Both Zeta and Agent Bennett had different voice actors (Gary Cole and Joe Spano, respectively) in their debut episode than they did on The Zeta Project and their other appearances on Batman Beyond (Diedrich Bader and Kurtwood Smith, again respectively). Also Zeta looked completely different in the episodes after his debut in the Poorly-Disguised Pilot that wasn't.
  • See also Big Time, voiced by Stephen Baldwin in his first appearance and Clancy Brown in his second. Justified mostly because at the time of his second appearance he was a deformed freak and sounded different then when he was normal.
• What Could Have Been: The show was commissioned by the WB to be a kid-friendly version of Batman. After a bit of a false start, they eventually got around to that, too.
  • One rejected script had Terry become an item with Maxine after Dana breaks up with him, penned by Alan Burnett. Timm shot the idea down, which is unfortunate for a large part of the fandom.
  • Mr. Freeze's role was originally just a one-off gag appearance, where Terry was getting a soda for Bruce and, in an awkward moment, would find Mr. Freeze's head and they'd briefly stare at each other, and then Terry would close the fridge and give the soda to Bruce. This was discarded because it was an insulting and unfitting ending for his character.
  • One rejected script featured the fully grown son of Superman and Lashina (from their brief affair in the Superman: The Animated Series episode "Legacy"). He has long since deposed Darkseid and become ruler of Apokolips, and now sets his sights on Earth. Lashina warns Earth of the invasion, so Batman teams up with Superman and the Justice League to defend Earth. Superman deals with the guilt of not knowing he had a son.