The pressure on the Second City cast must be immense. Approximately 92 percent of the most important figures in contemporary comedy and drama have come from the Chicago-based improv franchise. (Only about 6 percent are from L.A.’s Groundlings.) The most recent Second City alumna name to ring a bell is Tina Fey (class of ’96), though there are familiar names going all the way back to the 1955 Compass Players. The current touring company may or may not contain a bright star of the future, but I didn’t see a fat guy in the troupe’s press photo. In every improv group, there’s got to be a Large Man—a John Belushi, a John Candy, a Horatio Sanz, a, uh, Jim Belushi—to bellow across the stage and belly-flop into our hearts. This John Lutz character might be the guy; I can’t quite tell from the angle. The lineup does include Allison Bills and Jennifer Bills, who may be sisters. I guess that’s an acceptable substitute. Second City performs at 6:30 p.m. and 9 p.m. at the National Museum of Natural History’s Baird Auditorium, 10th Street and Constitution Avenue NW. $22. (202) 357-3030. (Dave Nuttycombe)