Altertale is an Undertale AU made by friisans, you can see most of the information here: https://friisans.tumblr.com/atmasterpost
Credits:
https://www.youtube.com/watch?v=PMQFCbcFVNs&t
Sound Design by Strelok: https://youtube.com/c/StrelokAudioDesign
Music by NyxTheShield - https://tinyurl.com/y8779yjg
Voice talents:
Lumisau - Chara https://twitter.com/DarcyMaguireVA
Adoxographist - Asriel/Undyne https://twitter.com/AdoxTalks
ProjectSNT (Courtney) - Bete Noire https://www.youtube.com/user/ProjectSNT
Zedrin - Gaster https://www.youtube.com/user/ZombieZephyr
jsmell - Sans https://www.youtube.com/user/djsmell1
Citrus - Papyrus/Noah https://citrusstorm.tumblr.com/
Strelok - Flowey/Ronan https://www.youtube.com/user/carmelo580
Dr.Eoj Puerte - Rave https://twitter.com/JoeF_NPorter
Oolay-tiger - Toriel https://soundcloud.com/oolay-tiger
Melodiva - Additional vocals : https://www.youtube.com/channel/UCtXR1U5-V54oCMgRlKRIDQg
Jocat - Additional vocals : https://www.youtube.com/channel/UCRDVE5L1LTWhmPAKKbUBGtg