A Random

SCIFI.radio story

Earth encounters a group of time-traveling tourists on a sightseeing trip to the past who are friendly but incomprehensible even though they all do bad impressions of William Shatner who tend to stutter under pressure when confronted by a bunch of Elvis impersonators , but scientists create a new weapon which turns them into weird rocks.
The End.but they die from catching the common cold.
The End.