Of course, troublemakers Loki and Peepo sneak off the Seeker before it launches...
Gampu, Laura and Tee Gar find the distress beacon, and Gampu recognizes the name of the ship stenciled on its side - Sunbeam... commanded by one Marcia Giddings (Dena Dietrich), an independent space trader with whom the Commander has some history. "Dear Marcia always had the happy faculty of being in the wrong place at the wrong time..."
"Well, Marcia, we meet again."
"I find you as I last saw you: on the brink of disaster. What havoc have you wrought this time?"
"Now, hold it, sonny..."
"I beg your pardon?"
"You've got your right shoe on your left foot again. It's you that's causing the trouble, not me."
"You haven't changed one iota!"
"Oh, yes, I have. I've come into the full flower of my womanhood."
"Albeit a bit wilted."
"You haven't changed either. Pity."
Turns out that Marcia had been mining for diamonds on the planet when the black robot appeared out of nowhere and destroyed her ship. Since then, she's been avoiding it and awaiting rescue. Gampu and company prepare to leave the planet, but unfortunately, there's still the hostile robot to deal with...
"You are a doll, Isaac."
"Never, never call me that."
"Three hundred years old and still acting like a baby over that name? It is yours, you know."
"Not by choice!"
"When, when, dear Gampu... when are you ever gonna loosen up?"
"Madam, I am as loose as I intend to be!"
Also, as a regular viewer then/fan now, it's a favorite because it hints of an intriguing history for the Gampu character beyond the established curmudgeonly grandfather/headmaster that we'd seen every other week. The idea that this ancient geezer had once been in love - and, clearly, it was a passionate, tempestuous relationship - showed a whole new side to the character. I probably didn't appreciate it when I was 13, but I do now.