Lord English is the matured form of Doc Scratch, who in turn is genetically spliced together from the First Guardian code, Lil' Cal and a cue ball I think? I forget how it went. And Lil' Cal is a puppet that was repaired from the puppet that landed with an Aradiabot on Alternia, brought to the troll session by Bec Noir. Bec got it from Bro, who stitched it together after it was torn apart by Dave. Bro originally got the puppet in the meteor lab where he was born, and it was flown there on a rocketboard after Dream Dave tossed it out of his Derse tower window. It was long thought that the puppet was in Dave's subconscious because he was terrified of the same puppet in the future, but it turns out to have been some kind of psychic voodoo doll left there by Gamzee, under orders from Lil' Cal further in the future, or possibly Doc Scratch (who, as it has been established, is also Lil' Cal even further in the future).
Gamzee ultimately did this in revenge for Dave linking him a video of Miracles by Insane Clown Posse. It is of some interest that this chronologically happened before ICP actually released the song in the real world. Dave received the video from Betty Crocker, who is actually the Troll Empress, who is working for Doc Scratch and Lord English.