Simplify the following text for a Grade 5 native English-speaking person.
Original: Star Trek VI : The Undiscovered Country is the sixth feature film in the Star Trek science fiction franchise and is the last of the Star Trek films to include the entire main cast of the 1960s Star Trek television series .
Simplified: Star Trek VI : The Undiscovered Country was the sixth film set in the Star Trek universe . It was the last film to be about the crew from Star Trek : The Original Series .