On June 12 the Psychotronic Film Society’s long-running weekly showcase of underrated or downright obscure feature films from around the globe continues with a rare public screening of the near-forgotten B&W nuclear holocaust drama “Ladybug, Ladybug.”

Made in 1963, just after the USA was gripped with terror by the Cuban Missile Crisis, this low-budget indie sleeper about a rural American elementary school whose teachers, administrators and students are frightened and confused by a nuclear attack warning siren boasts a phenomenal cast and even today packs a powerful wallop.

Directed by Frank Perry and co-written by his wife Eleanor Perry the film is something of a lost classic, and marks the big-screen debut of beloved character actor William Daniels (TV’s “St. Elsewhere,” “Knight Rider” and “Boy Meets World”). Frank and Eleanor Perry would later work together on a handful of other notable movies with cult followings, including “The Swimmer” and “Diary of a Mad Housewife.” He would later direct the Joan Crawford biopic “Mommie Dearest” on his own.

“Ladybug, Ladybug” was actually based on a real-life incident that occurred at an American elementary school and is one of the least-known but most affecting films ever made about the threat of nuclear war. The PFS will screen the full, uncut theatrical version of the film. Showtime is at 8 p.m.