A pleasure world mentioned in The Man Trap, where crewman Darnell had once met a woman whose appearance the M-113 creature borrowed to lure him.
Wrigley's Pleasure Planet is a recreational world mentioned in The Man Trap, the first Original Series episode to be broadcast.
On planet M-113, Kirk, McCoy and crewman Darnell each see Nancy Crater differently. Darnell sees a young blonde woman and blurts out that she looks exactly like someone he left behind on Wrigley's Pleasure Planet.
The remark is the first clue that Nancy is not what she seems. The creature has read Darnell's memory and taken the form most likely to draw him away from the others, and he becomes its first victim among the landing party. The planet is never seen.