This episode takes place in 3085.
Production number of this episode is B-505. While this was the third episode broadcast, it was fifth in production order.
This episode was used as the second half of the first compilation movie "Back to the Planet of the Apes" released in 1980, paired with the series' opener.
French title : "Le piège".
After the crash in the pilot Escape from Tomorrow (1974), the spaceship's chronometer reads 3085, however Alan states this was just the date when it stopped working and can't be relied on to be an accurate current date. Council Leader Zaius mentions the arrival of human astronauts ten years earlier who were executed before they could be questioned. Zaius wants these fugitives apprehended for further interrogation before they're put to death, but Urko continues to defy orders, plotting to murder them at every opportunity.