|Land of the Lost|
|Season 2, Episode 4|
|Air date||September 27, 1975|
|Written by||Bill Keenan and Dick Morgan|
|Directed by||Gordon Wiles|
Original Series, Season 2, Episode 3: "Fair Trade"
Original Series, Season 2, Episode 5: "The Test"
When a mysterious energy hole appears in the ground and swallows Cha-Ka, Holly attempts a rescue.