National Theatre, Robert Whitehead, Roger L. Stevens, Konrad Matthaei present Katherine Hepburn in a new comedy "A Matter of Gravity," by Enid Bagnold, with Charlotte Jones, Paul Harding, Christopher Reeve, Elizabeth Lawrence, Wanda Bimson, Daniel Tamm, Robert Moberly, scenery by Ben Edwards, costumes by Jane Greenwood, lighting by Thomas Skelton, directed by Noel Willman.