After our last Thing entry, regular correspondent Goldstar noted that there was a reason why the self-proclaimed idol of millions (Joe Baker) used a ring to switch from teenager Benjy Grimm (Wayne Morton) and back again.
"To Thing Or Not To Thing" offers some insight. By some unknown means, Ben was de-aged into a teenager, and stripped of his strength, which he could only access with the use of the two-part Thing Ring---which vanishes in the course of this particular fable.
After being advised by Professor Harkness (John Stephenson) to stay in the lab for 8 hours after an experiment meant to restore his adult self to full-time status, Benjy is goaded into going on a ski trip with snooty Ronald Radford (John Erwin). Chaos follows, of course.
Kelly had to hold back the tears, but that would be the first hint that there were signs of affection toward Benjy. The full origin in this continuity was never established, it would appear.