Peter Parnell's QED, which has been playing Sundays and Mondays at Lincoln Center Theater's Vivian Beaumont Theatre since Oct. 21 (with some breaks), will finally end its run June 10.

The first leg ran Oct. 21-Dec. 17, 2001, and then the work returned Feb. 17. Later, it extended its run until June 10. It was to have closed on May 13, but was extended.

The two-hander stars Alan Alda and Kellie Overbey. Alda plays Nobel Prize-winning, conga-beating professor of physics Richard Feynman. The play was once called Tuva or Bust! and is based on the book that goes by the latter title, written by Feynman and Ralph Leighton. It traces the two men's friendship from the first discovery of a mutual passion for drumming to Feynman's many wild tales of safe-cracking at Los Alamos, sharing gambling tips with Nick the Greek, joking with Einstein and finding the frozen "O Rings" — the cause of the space shuttle Challenger disaster.

Alda last appeared on Broadway in Yasmina Reza's Art. Other Broadway credits include the musical, The Apple Tree and Neil Simon's Jake's Women. He was nominated for a Tony Award for both roles. Kellie Overbey plays Feynman's student. The show played the Mark Taper Forum in spring 2001. Overbey has starred on Broadway in Buried Child and Present Laughter and Off Broadway in Betty's Summer Vacation (as Betty) and The Hologram Theory.

Tickets are $60 and $40. Call Tele-Charge at (212) 239-6200.