By Ratboy Genius YouTube YouTube and Ryan Dorin.
Duration: 2:12.

Listen on YouTube or Bandcamp.

Tracks that reference Ratboy Genius Theme Song:

From Fandom:

• It Came From Volume 8 by ostrichlittledungeon
• Downwards by StarlightCalliope

Lyrics:

Knock knock!
It's me the Ratboy Genius!
I just came over to say hi.
I am the little Ratboy Genius.
I hope we have a happy time.
Wee! I am the Ratboy Genius!
Wee! I am the Ratboy Genius!
I live in Ratboy's Kingdom.
Yay for me the Ratboy Genius!