The Street Demonz are a criminal motorcycle gang that operates in Gotham City.
When the Sirens had to close their blackmarket weapon shop, Selina Kyle revealed to Tabitha Galavan that she had a backup plan, and knew where the Street Demonz hid their stash of money. Tabitha said she was not going to rip off one of the biggest biker gangs in Gotham and told Selina to find another job. Regardless, Selina then snuck into the Street Demonz' chop shop and past the gang members. However, Selina inadvertantly caused a car alarm to go off when she attempted to steal from the trunk of the car, alerting the gang members and trapping her with no way out. Tabitha then got a call from Selina who explained that she was trapped and couldn't make her escape without being seen, as more bikers had arrived hearing the alarm. Galavan called her an idiot and reluctantly agreed to come and get her. Before leaving to get Selina, Tabitha informed Barbara Kean that Selina wants a purpose, a home and someone who cares for her. At the gang's clubhouse, Tabitha created a diversion so she could sneak in and get Selina. The pair then evaded capture as Barbara came to their aid and shot the Street Demonz members. Afterwards, the Sirens left the place with the Street Demonz' money.
Some time later, the Sirens and a Street Demonz boss from whom they stole from gathered at the Iceberg Lounge to clear things up with Oswald Cobblepot, since the Demonz paid for one of Penguin's licenses. However, Oswald's bookkeeper Arthur Penn entered the room and whispered something in Cobblepot's ear which caused him to scream in rage. He then ordered Penn to repeat the information for his guests. It turned out that Edward Nygma, who "owes his life to Cobblepot's mercy" was repaying that generosity by "making fun of his benefactor in a crude comedy show". Due to Selina Kyle's blankness, Penguin explained to her that Nygma is making fun of him in a clown show in the Narrows. Noticing Selina's amusement, Oswald started to laugh himself. But when the Street Demonz boss joined in to satisfy Cobblepot and called Nygma "Riddler", Penguin drew a knife hidden in his cane and stabbed the biker in the throat. He then told the dying man that "Riddler" is not Nygma's name, instead it is simply "plain dumb Ed" and that since he doesn't know Nygma he doesn't get to laugh. Barbara Kean then thanked Oswald for solving the problem for the Sirens, but Penguin responded that what they owed the Demonz boss they now owed him. Cobblepot ordered them to go to the Narrows to see Nygma's act themselves, then kidnap him and bring him back to Cobblepot by nightfall.
At some point during the following few months, the Street Demonz gang dissolved due to unknown reasons.
Some time later, a former member of the Street Demonz called Lars, became a contestant on Edward Nygma's game show "The Riddle Factory". During his show, the Riddler mocked the Street Demonz for becoming defunct. Lars incorrectly guessed an answer to one of Nygma's riddles and was then presumably killed.
Edward Nygma woke up to find a Street Demonz member named Tank tied up in the shower where he stated that Edward had, in fact, shown up and asked for information. After Edward repeated the process, Tank mentioned that he wanted to know the location of the Street Demonz new clubhouse. After agreeing to take Nygma there, both of them found the gang's leader, Emmanuel Vasquez, and the Street Demonz members dead with a graffiti stating "Penguin was Here." Nygma suspects that someone is trying to start a gang war.
The Street Demonz subsequently attacked Oswald Cobblepot's stronghold in retaliation for what had happened to their members at the clubhouse. After Cobblepot shoots most of the bikers down, he learns what happened earlier to the Street Demonz and the Undead from it's unnamed leader. Cobblepot then states that someone must have framed him and chains up the survivors. The next day, Cobblepot finds that most of his men have left and releases the leader. The other captive who was chained up had died overnight. Cobblepot ordered the Street Demonz leader to round up his gang, the Lo Boyz, and the Undead as they head to Haven. After Cobblepot got Gordon to surrender, the three gangs turn against Cobblepot and imprison him with Gordon. Thanks to Will Thomas, Gordon and Cobblepot worked together to drive the gangs away.
- † Street Demon (Lieutenant)
- † Head Demon (Lieutenant)
- † Guard Demon (Member)
- Lars (Member)
- Tank (Member)
- "A Dark Knight: A Day in the Narrows"
- "A Dark Knight: Stop Hitting Yourself"
- "A Dark Knight: Mandatory Brunch Meeting"
- "Legend of the Dark Knight: Year Zero" (mentioned on map)
- "Legend of the Dark Knight: Trespassers"
- "Legend of the Dark Knight: Penguin, Our Hero"
- "Legend of the Dark Knight: Ruin" (indirectly mentioned)
- "Legend of the Dark Knight: The Trial of Jim Gordon"
- In the DC Comics, the Street Demonz are a criminal biker gang operating in Gotham City that is known for vandalism, theft and drug trade. It is one of the city's oldest gangs that already existed during Bruce Wayne's teenage years. They first appeared in Detective Comics #614 (May 1990) by Alan Grant and Norm Breyfogle.
- Blake, Peter (writer) & Behring, John (director) (November 2, 2017) "A Dark Knight: A Day in the Narrows". Gotham. Season 4. Episode 7. FOX.
- Huston, Charlie (writer) & Bailey, Rob (director) (November 9, 2017) "A Dark Knight: Stop Hitting Yourself". Gotham. Season 4. Episode 8. FOX.
- Lilien, Steven & Wynbrandt, Bryan (writer) & Vrvilo, Maja (director) (April 5, 2018) "A Dark Knight: Mandatory Brunch Meeting" Gotham. Season 4. Episode 17.
- Stephens, John (writer) & Cannon, Danny (director) (January 3, 2019) "Legend of the Dark Knight: Year Zero" Gotham. Season 5. Episode 1.
- Milto, Louis Shaw (writer) & Cannon, Danny (director) (January 10, 2019) "Legend of the Dark Knight: Trespassers" Gotham. Season 5. Episode 2.
- Chun, Tze (writer) & Bailey, Rob (director) (January 17, 2019) "Legend of the Dark Knight: Penguin, Our Hero" Gotham. Season 5. Episode 3.