Seekers: Second Nature (Star Trek: The Original Series)

The explorer ship Sagittarius lands a team on a planet to investigate odd energy readings and finds itself caught up in events as everrything starts t head south.
As usual with any new series, there's a wide group of characters to get used to, but they all come across as you'd expect.
The story is good but ends on a cliff hanger, which makes it feel unfinished.