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Webster 1913 Edition

Noun.

Subordinate action; a minor action incidental or subsidiary to the main story; an episode.

The least episodes or

underactions

. . . are parts necessary or convenient to carry on the main design.

Dryden.

Noun.

Subordinate action; action not essential to the main story.

The least episodes or underactions - are parts necessary to the main design.

underaction ‎(plural underactions)

Subordinate action; a minor action incidental or subsidiary to the main story; an episode.
The least episodes or underactions […] are parts necessary or convenient to carry on the main design. — Dryden.