Gambatese and Hansen will join a cast that includes Dee Roscioli as Elphaba, Kim Zimmer as Madame Morrible and Tom McGowan as The Wizard.
The company also features Justin Brill (Boq), Clifton Davis (Dr. Dillamond), Demaree Hill (Nessarose) and Laurel Harris (standby for Elphaba) with Dina Bennett, Lauren Boyd, Kyle Brown, Antonette Cohen, Rick Desloge, Timothy A. Fitz-Gerald, Napoleon W. Gladney, Brenda Hamilton, Courtney Iventosch, Trevor Ryan Krahl, Philip Dean Lightstone, Marissa Lupp, Michael Mahany, Jonathan McGill, Kevin McMahon, Cassie Okenka, Shayla Osborn, Christopher Russo, Adea Michelle Sessoms, Sarah Schenkkan, Pamela Shandrow, Ben Susak, Shanna VanDerwerker and Mikey Winslow.
Gambatese starred on Broadway as Jane in Tarzan and Natalie in All Shook Up. Other Broadway credits include Hairspray, Is He Dead?, A Year with Frog and Toad and Footloose.
Hansen has been seen on Broadway in Next to Normal (as well as the first national tour) and Hairspray.
Wicked is playing through March 17 at the Segerstrom Center for the Arts in Costa Mesa, CA. Tickets can be purchased at SCFTA.org, at the Box Office at 600 Town Center Drive in Costa Mesa or by calling (714) 556-2787.
The hit musical will play The Tucson Music Hall, March 20-April 7. Tickets are available at the TCC Box Office, online at broadwayintucson.com or ticketmaster.com/wicked or by calling (800) 745-3000.