Professor Carter Nichols had been a regular guest in the Batman comic for years, but Detective 116 (Oct 46) marks his first appearance in this book.
Nichols is shown only briefly, at the beginning and end of the story, which is normal for this character. Professor Nichols has invented a method of time travel through hypnosis, in which Bruce and Dick get put under in his office, and awake in a different time period, although their bodies remain in the present as well.
In this story, with no preamble, they set out to go meet Robin, which they do, as well as the Merry Men, Maid Marian, Friar Tuck and the whole crew, getting involved in the standard ‘archery competition before the Sheriff of Nottingham’ plot.
The story is pretty bland, really. The best scene has Batman and Robin Hood working together to escape after they are thrown in the dungeon.
At the end, they wake up and Nichols comments, as he frequently does, that under hypnosis they called each other Batman and Robin, and again, Bruce and Dick make really lame excuses.