They scratch, claw, call each other vicious names and, at the end of Act I, they tear each other’s wigs off. What? You thought all that hair was real? Nobody does a catfight better than Joan Collins and Linda Evans. Yes, the Dynasty co-divas are reunited in Legends, the late James Kirkwood’s comedy about aging stars with ancient egos. Carol Channing and Mary Martin toured in the show the first time around, and now it’s been revived for Collins and Evans—for whom it does, indeed, seem the perfect vehicle. Legends is at the LaSalle Bank Theatre through March 4; 312-902-1400; $20-$75. Pic by Carol Rosegg