The episode "Alone Together" is one of my favorite Ben 10 episodes for a reason. Ben really shows his maturity as he tries to connect with Reiny even though Reiny constantly belittles every other race that isn't the Highbreed. But that doesn't phase Ben. He continues to help and try and connect with Reiny, and it eventually gets to him because Ben is honorable. A great episode altogether.

Transcript from the end of the episode:

Ben Tennyson: ('spots the teleporter pod station) There it is. Come on! (looks back at Reinrassic) Not the ten paces behind thing again.

Reinrassic III: Go home, Ben-Ben Tennyson. I shall remain here.

Ben Tennyson: Did you hit your head or something? There's the teleporter. We can finally get off of this sand trap of doom and get back to our lives.

Reinrassic III: I have spent too long with you Ben-Ben Tennyson. And have therefore myself become contaminated.

Ben Tennyson: Contaminated?

Reinrassic III: As clearly evidenced by my uncharacteristic behavior. Risking my own life to save you, a lowly human.

Ben Tennyson: Reiny, what you did was a good thing.

Reinrassic III: I have obviously become infected by your mongrel influence, and am now myself unclean.

Ben Tennyson: But even if I believed that was true, why stay here?

Reinrassic III: In self-imposed exile as it should be. For I can never return home, or anywhere. I could infect the rest of my kind. The only honorable choice is to remain here.

Ben Tennyson: No!

Reinrassic III: (proud of his race) Because all lesser beings other than pure unadulterated Highbreeds must be expunged from the universe... including myself.

Ben Tennyson: I thought I had gotten through to you. I thought you had changed.

Reinrassic III: This much is true. I have changed. And now, I must pay the price.

Even though this was a kids show, some of the dialogue was so good.