What formerly felt like a tomb—Theater Too! beneath the venerable Theatre Three—has lately become Dallas' best underground (literally) theater. Last season, audiences filled the tiny space for the two-man musical The Big Bang and Bruce R. Coleman's new play, Look What's Happened to Pixie DeCosta. Year after year, tickets fly for the return of I Love You, You're Perfect, Now Change, which this year had its best cast ever. At $20,000 over last year's box office take for Theatre Too!, the uptick in ticket sales is continuing with the season opener of Six Dance Lessons in Six Weeks, followed by the intimate musical Another Night Before Christmas, then the drama Bill W. and Dr. Bob about the founding of Alcoholics Anonymous. Director-producer Terry Dobson has done a bang-up job overseeing the makeover of Theatre Too!, which finally deserves that exclamation point.