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From the liner notes

Reunited for the only time after their triumph in Mel Brooks' The Producers, Gene Wilder and Zero Mostel catapult their shared genius for elegant slapstick, manic wit and sly satire to an unmatched level of fearless absurdity. Together with director Tom O'Horgan, originator of the Broadway smash hit Hair, Mostel and Wilder transforms playwright Eugene Ionesco's Theater Of The Absurd curio Rhinoceros into a fluid, character-rich screen comedy.

In the face of a modern urban life devoid of anything but an uninterrupted parade of dehumanizing compromise, disappointment and emptiness, Stanley (Wilder) tenuously guards his fragile individuality in between gulps of booze. The only solace he enjoys is commiseration with his self-consciously sophisticated neighbor John (Mostel), and his unspoken adoration of co-worker Daisy. But as a surreal comic apocalypse begins to transform everyone in Stanley's world into a rhinoceros, the non-conformism that seemed like Stanley's downfall may be his only salvation.

Re-creating the role he originated on stage, Mostel delivers the most jaw-droppingly bravura performance of his career, playing off both Wilder's and his own incredulous terror as fussy, prissy John metamorphoses (entirely without make-up or camera tricks) into a bellowing rhinoceros. Mostel, Wilder and Black's generous characterizations and pitch-perfect comic timing streamline Rhinoceros' convulsive outrageousness into an ardent valentine to both knockabout screen comedy and Ionesco's experimental and timely satire.