In a Radio Times interview, it is mentioned that Jonathan Groff had not seen Doctor Who before getting the call from RTD. Then (I'm assuming) RTD advised him on what episodes to watch, but Groff couldn't tell the interviewer which ones. I couldn't find any speculation on this after a few searches so I thought I'd throw it in here. What episodes do you think he watched to prepare to play Rogue?

Here's the quote and the link to the full interview:

As part of your homework, you watched six specific episodes from the show’s 60-year history, including the very first one from 1963. Which were the others?

"I can’t tell you! But even in that first episode in 1963, there was something that felt alternative or queer about it to me. When they go inside, and the Doctor says to them you know, they can’t understand how something so small that they walk into is so expansive. And he sort of explains that it takes time to understand things that you don’t immediately know...."

https://www.radiotimes.com/tv/sci-fi/doctor-who-jonathan-groff-rogue-interview/