These are some of general fan theories in the DCAU.
General[]
- Jason Todd exists in this universe.[1]
Batman: The Animated Series[]
- Batman's foes are actually parts of his psyche.[2]
- Harley Quinn and Scarecrow were romantically involved, or at least knew each other, during Harley's college years.[3]
- Bruce Wayne lost his virginity to Zatanna.[4]
Batman: Mask of the Phantasm[]
- The Phantasm has supernatural powers.[5]
The New Batman Adventures[]
- The Scarecrow, by the time of The New Batman Adventures, is a zombie.[6]
Batman Beyond[]
- Warren and Mary McGinnis divorced because Warren was suspicious of the fact that both their sons had black hair.[7]
- Due to his 3 months in juvie, Terry was held back a year in school, making him 19 when he eventually graduates.[8]
- Bruce Wayne named his dog Ace after the young villain he knew during his time with the Justice League.[9]
Batman Beyond: Return of the Joker[]
- Debunked - The Joker is the Dee-Dee Twins' grandfather. [10]
- Debunked - Poison Ivy is the Dee-Dee Twins' creator.[11]
- The Creeper is the Dee-Dee Twins' grandfather.[12]
- The Scarecrow is the Dee-Dee Twins' grandfather.[13]
- Nightwing is the Dee-Dee Twins' grandfather.[14]
- Tim Drake is the Dee-Dee Twins' father.[15]
- Debunked - The flashback takes place before Justice League, with the Joker in that show actually being Tim Drake under the effects of the Cadmus tech.[16]
- Debunked - The flashback takes place before Justice League, with the Joker recovering from his supposed death only to truly by killed by Ace during "Wild Cards".[17]
- Debunked - The flashback takes place before Justice League, with the Joker in that show being a Cadmus clone of the original made before his death.[18]
- Ghoul is a descendant of the Scarecrow.[19]
- Ghoul is a descendant of one of the Underdwellers.[20]
- Tim Drake has systemic hypoplasia, explaining why he looks so young in the flashback sequence.[21]
- Tim Drake used a Lazarus Pit at one point, explaining why he looks so young in the flashback sequence.[22]
- Harley's role in helping the Joker torture Tim Drake was actually an uncover mission for Amanda Waller and Task Force X to retrieve the stolen Cadmus tech. After she fell into the pit, she was extracted and helped into hiding.[23]
- Harley didn't really fall into the pit; Batgirl was having a relapse into the Fear Toxin incident during The New Batman Adventures, "Over the Edge", causing her to believe that Harley fell.[24]
- Debunked - Joker used Mad Hatter Technology to take over Tim Drake's body.[25]
- By this point in time, Harley Quinn had lost all trace of humanity, becoming just as heartless as the Joker, which is why he is more affectionate towards her.[26]
Justice League[]
- The Batsuit that Batman is wearing is the same one from The New Batman Adventures, just animated differently.[27]
- Killer Frost is actually Dora Smithy, ex-sister-in-law of Mr. Freeze.[28]
- Hippolyta was Wonder Woman before Diana. [29]
Justice League Unlimited[]
- Brainiac 5 is the result of the Brainiac/Gear merger from Static Shock, "A League of Their Own".[30]