Oh boy, this took way too long.

Error's pov

  "ERROR!!!!" I heard US!Frisk shout. "Yeah Frisk?" "Have you seen Controlled!Chara? My Chara just finished a pacifist run and I missed them." I looked around. "No, I haven't-" I stopped myself mid-sentence, sensing an anomaly in UnderControl. "Something's wrong. I'll be back in a bit." Frisk nodded as I made a portal to the AU.

  I stood in front of the Sans of the AU. "Oh, hi Error!" He said. "Hi. Now, what did you do to Chara?" I said, my eye sockets turning black. I also stopped time, just in case. "What?" was his answer.

Player's pov

  I was walking away from that weird encounter with Undyne when suddenly, my screen froze. I sighed. Guess it's time for lunch.

Error's pov

  I sighed in annoyance. "There was an anomaly and your Chara has been missing for way too long. So, Lifeline (this Sans), I won't ask again. Answer the question!" He sighed. "You sensed it, huh? I didn't do anything. The anomaly must've been the kid." I just started. He must've realized that I was confused, because he started to explain.

*After explaining*

  Wow. Wow. I was NOT ready for that. "So... what now?" I asked. Lifeline first shrugged then looked like he had an idea. "Get Dream. We need to enter their mind. I can do it, but I need back up.*" I nodded, then made a portal to Nightmare's castle. "Nightmare!" I called out. The goopy skeleton looked up from his book. "Hey Error." "Do you know where Dream is?" "No, you think I have constant tabs on him or something? But if you must know, he is in Underswap with Ink and Blue." He looked back down at his book. I sighed, opening a portal while saying "Why are you like this?" He shrugged and I walked through.

I walked out in front of them, making them stop walking. "What do you want, Error?" Ink asked. "I need Dream's help. Lifeline asked his help to save his Frisk and Chara from this "Player" character. I decided to help since I rather enjoyed their company before they disappeared a while ago." They nodded, knowing how much I liked the"Fallen Ones" "Sure!" Dream responded. "I'll call you when it's time." He nodded and I left.

Player's pov

Finally, my screen un-froze. Let's continue.

*Lifeline can enter minds thanks to experimentation.