With so much of J.R.R. Tolkien's "Lord of the Rings" trilogy devoted to frenzied chases, hairbreadth escapes, and fiery battles, it's natural that Frodo a-Go-Go, the Free Associates' improvised spoof of this fantasy epic, should also feature thrilling scenes of derring-do. And who more natural to help the troupe out than Babes With Blades, Chicago's all-female stage-combat company? The fights themselves can't be improvised, of course, but have been choreographed by Dawn "Sam" Alden. Swordplay in the Royal George's pocket-size gallery might seem a risky proposition, but the Babes live up to their reputation as the safest fighters in town, swinging broadswords and battle-axes with no threat to audience members or fellow players. The usual Free Associates are seamlessly incorporated into the action, and the swashbuckling mayhem that results is more fun than a hobbit hootenanny. Royal George Theatre Center, 1641 N. Halsted, 312-988-9000. Open run: Fridays, 7:30 PM; Saturdays, 9:30 PM; Sundays, 3 PM. $20.