Henry Linnell was born in 1998 to the family of John Linnell. He made a brief debut appearance in Gigantic, during which he informed viewers about the difference between eyes and eyeballs (eyeballs are in your head, eyes are on your face) and discovered the camera viewfinder while eating a bagel sandwich.
He did some speaking for "Letter/Not A Letter" on Here Come The ABCs. On Here Come The 123s, Henry voiced the role of one of the "Sevens" on the song "Seven." He also made a brief appearance in "Havalina".