|From the episode:||Stewie Griffin: The Untold Story/Stu & Stewie's Excellent Adventure|
"I Am The Monarch of the Sea" is a song from H.M.S. Pinafore, a comic opera in two acts, with music by Arthur Sullivan and a libretto by W. S. Gilbert.
Stewie Griffin sings the song during the first round of rehearsals for his 30-year-old self Stu's sexual intercourse with Fran in Stewie Griffin: The Untold Story, the "Stu & Stewie's Excellent Adventure" segment.
Stewie: And here we go, and watch my hand and 1-2-3
Put it in, take it out, put it in, take it out
put it in, take it out, put it in, take it out
I am the Monarch of the sea
The ruler of the Queen's Navee*
Whose praise Great Britain loudly chants
And we are his sisters, and his cousins, and his aunts!
- Gilbert and Sullivan's spelling