In Step Up 2: The Streets, Briana Evigan plays Andie West, a Baltimore street dancer who is still grieving her mother and dances with an illegal crew called the 410. She is billed first, and The Numbers lists only two leading cast members, her and Robert Hoffman. Andie is a new character, so this film is Evigan's first appearance in the franchise.
Robert Hoffman as Chase Collins
Robert Hoffman plays Chase Collins, one of the top dancers at the Maryland School of the Arts, who helps Andie West win a place there. Disney's D23 entry for Step Up 2: The Streets describes Chase teaming up with Andie to form a crew of outcast classmates for The Streets, the underground battle at the center of the story. Hoffman is new to the franchise and shares lead billing with Briana Evigan.
Will Kemp as Blake Collins
Will Kemp plays Blake Collins, the older brother of Chase Collins in Step Up 2: The Streets, and Screen Daily describes Blake as a ballet performer who returns to lead the school. In a 2013 Official London Theatre interview, he said dancing the Swan in Matthew Bourne's Swan Lake was his big break as a dancer and Van Helsing was his break as an actor.
Cassie Ventura as Sophie Donovan
Cassie Ventura plays Sophie Donovan and is billed fourth in the TMDB credits, ahead of most of the dance ensemble. Billboard reports that Step Up 2: The Streets was her acting debut, which came in 2008. Disney's D23 entry and The Numbers both list her as Sophie.
Adam Sevani plays Robert Alexander III, credited with the nickname 'Moose', in Step Up 2: The Streets and is billed fifth. This film is the character's first appearance. The TMDB credits for Step Up 3D (2010) show Sevani returning in the same role, billed third behind Sharni Vinson and Rick Malambri.
Black Thomas as Tuck
Black Thomas plays Tuck in Step Up 2: The Streets and is billed sixth. Screen Daily names him in the supporting cast alongside Adam Sevani, Danielle Polanco and Harry Shum Jr., and The Numbers lists him as Tuck. He does not appear in the TMDB credits for Step Up 3D (2010), so Tuck does not return in the next sequel.
Harry Shum Jr. as Cable
Harry Shum Jr. plays Cable in Step Up 2: The Streets and is billed seventh. Screen Daily lists him in the supporting cast, and Disney's D23 entry credits him as Cable. The TMDB credits for Step Up 3D (2010) show him returning as Cable, which makes him one of several dancers from this film who carried their characters into the third film.
Channing Tatum plays Tyler Gage, the role he led in Step Up (2006), where TMDB bills him first. In Step Up 2: The Streets he returns in a supporting role and is billed eighth. In the story, Tyler is Andie's friend who urges her to audition for the Maryland School of the Arts, which makes him the main bridge between the two films.
Kate Lacey as Administrator
Kate Lacey plays the character credited as Administrator in Step Up 2: The Streets and is billed ninth on TMDB. She does not appear in the TMDB credits for Step Up (2006) or Step Up 3D (2010), so this is her only appearance across those three films.
Alison Faulk as Alstar
Alison Faulk plays Alstar in Step Up 2: The Streets and is billed tenth on TMDB. The Numbers also lists her in the supporting cast as Alstar. Faulk does not appear in the TMDB credits for Step Up (2006) or Step Up 3D (2010), which makes Alstar a role from this film only among those three.
Sonja Sohn as Sarah
Sonja Sohn plays Sarah, the guardian Andie lives with after her mother dies of cancer. The casting gives the film a familiar Baltimore face. NPR reports that Sohn played Detective Kima Greggs on HBO's The Wire and kept working in Baltimore after the show ended, and Disney's D23 entry confirms that Step Up 2: The Streets was filmed in Baltimore.
Telisha Shaw as Felicia
Telisha Shaw plays Felicia in Step Up 2: The Streets and is billed twelfth on TMDB. The role appears in Disney's D23 cast list and in The Numbers supporting cast, and Screen Daily names her in the film's ensemble. She does not appear in the TMDB credits for Step Up (2006) or Step Up 3D (2010), so Felicia is new to the franchise here.