I'm glad you finally got to RPM! I'd say "Doctor K" is the best episode of the season, and well up there with the best episodes of the Disney era. There's a beautiful interaction with Doctor K and the twins that I rarely see people discuss, but I feel it's a highly significant point in Doctor K's character development.
Gem & Gemma: "Happy birthday! And surprise!"
Doctor K: "For me? But ... why?"
Gem & Gemma: "It's your birthday. And we're friends!"
Doctor K: "Gem, Gemma, you two should know, I don't even like you."
Gem & Gemma: "That's okay, we know. But we can still like you, can't we?"
You can see it there, beautifully portrayed by Olivia Tennet in that moment. She has this look of "Oh. I get it now." She's finally understanding what it means to have a friend and, more importantly, why it's important to have people in your life. Alphabet Soup had taken everything away from her: her freedom, her identity, even her name. This was the moment where she started to take them back. It's very telling, I think, that we never see the faces of the Alphabet Soup agents. They are symbolic of the forces in our own lives that attempt to oppress and intimidate. That's probably giving more credit to a show for kids, but still.
My favorite five episodes. You'll see that they're mostly centered around Doctor K, Scott, and Colonel Truman.
1. "Doctor K" - for reasons I wrote above.
2. "Heroes Among Us" - a very important episode for Scott and Colonel Truman and a significant moment in Scott's character development. He messed up big time when he left his post to go try and prove himself to his father. Instead of doing the thing many past Red Rangers have done (in general, trying to justify their actions), Scott admitted that he was wrong and refused to accept the medal of valor until he had honestly earned it.
3. "Ancient History" - another important episode for Colonel Truman and Doctor K. While pardoning her for creating the threat that literally destroyed most of the world may have been a bit of a stretch, the episode had a very important moral. Forgive and forget. And it's just as important for you to forgive yourself for your own mistakes.
4. "Danger and Destiny" - it's the finale. I could write an entire essay about it. Just suffice it to say, it was amazing.
5. "If Venjix Won" - it's odd, even to me, that I would include a clip show in my list of my favorite episodes. However, it was another important episode for Doctor K, and in particular for her growing relationship with Ziggy. It was again a bit of a stretch that Summer guessed the correct password, but the look she and Doctor K shared at the end of the episode after Summer had told the others the password was "Mr. Marshmallow" was very heart-warming. Ziggy was a ten in Doctor K's eyes.
Potential spoilers for Beast Morphers
If the rumors are true and Evox is Venjix, Beast Morphers just became a whole lot more interesting to me. I would have been okay with never having the cliffhanger at the end of RPM addressed, but it's pretty cool.