* Based on Comet in Moominland by Tove Jansson.

Unusual things have been happening in Moominvalley. Moomin, Sniff and Mee leave for the Observatory on the Lonely Mountains to confirm the Muskrat's words: a comet is about to hit Moominvalley and destroy everything. On the way they meet Snufkin, the Hemulen and the Snorks and experience many adventures.

Source: ANN

Note: Shown as triple feature along with Hana no Mahou Tsukai Mary Bell: Phoenix no Kagi and Little Twins: Bokura no Natsu ga Tondeiku.

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Sequel: Muumin (1972)
Sequel: Tanoshii Muumin Ikka