These four performers are as brazenly committed to improv's "affirm everything" mantra as any I've seen. Their dark, flamboyant comic sensibilities clearly aligned, they orchestrate black-comedy vignettes tethered to richly odd characters. But what most impressed me was how fluidly and creatively they transitioned between scenes, usually dangerous improv moments. The Frank Hayes 4 opens. --Ryan Hubbard
$12
There's just something about cussing puppets--and this improvised puppet show by the Atticus Finch ensemble suggests bitter, rejected prototypes of Elmo, Chewbacca, McGruff the Crime Dog, and Crank Yankers/Muppets characters ganging up in a dark alley off Sesame Street. But the troupe's nine members exceed the old, easy laugh of vulgar-talking innocents: after tutorials from professional puppeteers and a few months of practice, they display sophisticated physical control as they wield the puppets from behind the curtains of a bilevel ministage. Seamlessly creating gestures and quick takes (hilariously deadpan on the perfectly blank cartoonish faces), they also smoothly execute difficult maneuvers like sliding a quarter across a bar or crossing the stage via motorized scooter. Sharp timing and self-mockery point to the performers' long experience together, though the motley mob of puppets takes center stage: Felt is improv cut from new cloth. --Ryan Hubbard
$5
At the top of this highly entertaining show from Porchlight Music Theatre, cast members ad-lib five songs based on titles suggested by the audience. Then we vote for our favorite, and the winner serves as the foundation for a wholly improvised, hour-long musical comedy. On the night I saw the show, the winning number, "When Todd Met Michael," inspired Nativity My Way, an LGBT retelling of Christ's birth involving a carpenter and the burly gym owner he miraculously impregnates. It was hilarious, blasphemous, and heartwarming in equal measure. The charming, whip-smart cast are accompanied on piano by the show's creator and musical director, Matthew Loren Cohen, who churns out one catchy tune after another. —Zac Thompson
$10-$15
A comedy-music game show where contestants tell a funny anecdote which is then set to music.
$5
A comedy supergroup consisting mainly of former members of People of Earth, 3033 creates some of the liveliest, most consistently solid improv around. Members Andy St. Clair and Alex Fendrich have been highlights of recent Second City E.T.C. shows; Rush Howell, a lawyer by day, is one of the scene's wittiest performers; and Bill Arnett and Danny Mora are personable comedians with off-beat senses of humor. Unlike most troupes at iO, 3033 doesn't stick with the Harold improv format. Instead, they play it loose, letting an audience suggestion and Jason Chin's playful music and light effects steer them. At a recent show the topic of gangs inspired a hilarious 70s-era game show. --Ryan Hubbard
$5