Mr. Frundles
I love the Mr. Frundles scene in Solaricks. I mean it was so funny that Rick knew Mr. Frundles was very dangerous but kept him around just because the scientist thought Mr. Frundles was cute. Then there was the darkly humorous moment where after the Smiths are able to escape, Space Beth asks why not go back to Earth and fix everything only for Mr. Frundles to immediately afterwards reduced that version of Earth to a lifeless rock with his face on it.