|Date||Sep. 15th 2006|
Filler Art is the 157th xkcd comic.
If the comic didn't explain it enough, this is just a filler comic. Filler comics are meant to "fill in the gap" from when people are expecting a new comic and when the author might not have one finished yet.
This one does have a slight joke to it. The new character presented is nothing more than basic stick figure, ergo not being new at all.
"Maybe I should let up on Megatokyo a little?"