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Treens

The Treens are fictional aliens in the Dan Dare stories. They first appeared in Dan Dare: The First Story, which was serialized in the Eagle comic magazine from Volume 1, Number 1 (April 14, 1950) to Volume 2, Number 25 (September 28, 1951). The story was drawn by Frank Hampson.

Wiktionary

treens

n. (plural of treen English)