Program Preview

For the week starting Thursday, April 25. Times are E.S.T. through Sat., April 27, E.D.T. thereafter.

TELEVISION

Playhouse 90 (Thurs. 9 130 p.m., CBS).

Helen Hayes, in Four Women in Black, is one of a group of nuns crossing the Arizona desert in 1870.

Person to Person (Fri. 10:30 p.m., CBS). Ed Murrow visits the Archbishop of Canterbury, Soprano Roberta Peters.

Big-League Baseball (Sat. i :30 p.m., NBC). Brooklyn v. Pittsburgh.

Caesar's Hour (Sat. 9 p.m., NBC). TV's best regular comedy show.

The Last Word (Sun. 3 3:30 p.m., CBS).

Comedienne Hermione Gingold and Au thor Walter Lord join the panel.

The Kate Smith Hour (Sun. 9 p.m., ABC). A special salute to Kate.

The Mike Wallace Interview (Sun.

10 p.m., ABC). Gloria Swanson sits for the network debut of New York TV's most frankly probing interview show.

Producers' Showcase (Mon. 8 p.m., NBC). Cinderella, the Prokofiev ballet danced by Margot Fonteyn and Britain's Royal Ballet (color).

Middleweight Championship Fight (Wed. 10 p.m., ABC). Return match between Champion Gene Fullmer and ex-Champ Sugar Ray Robinson in Chicago.

RADIO

Conversation (Thurs. 8:30 p.m., NBC). John Gunther and Theodore White join Clifton Fadiman in discussing "My Favorite City."

The Woolworth Hour (Sun. 1 p.m., CBS). The looth broadcast.

Clarence Darrow -- 100 Years Later (Wed. 10:30 p.m., NBC). A memorial.

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