Question about star trek?

Question

my mom was a very big star trek fan and what to know what episode in the origanal series with captain kirk had some type of floation ball on a petastil that was a computer and talked.

if you dont know but have an idea where she could find out that would be helpfull.

Answer 1

The first Star Trek movie had the probe "V'ger" that was a composite of the Voyager space probe and an alien computer.

And in Season 3, the episode "The Changeling" has a space probe (a floating cylinder with a round top) called "Nomad" that threatens the ship.

Answer 2

Sargon was inside the ball, and there were two more in the next room.  The Episode was "Return to Tomorrow"