It’s a hot, breezy night in North Portland’s Cathedral Park, and Ryan Castro is being pummeled in the stomach by Dan Clark.

These aren’t two drunken louts swinging punches after leaving a nearby dive bar. They’re actors in “Trek in the Park,” the annual presentation by Atomic Arts of a classic 1960s “Star Trek” episode, which begins a month-long run Saturday in the natural amphitheater underneath the St. Johns Bridge in North Portland.

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