Plank is the imaginary friend of Jonny 2x4 in the form of a plank of wood with eyes and a mouth painted on it in a haphazard manner. Although he is claimed to be a living being, he is never heard or seen moving on screen. However, Jonny seems to be able to understand what he is saying. is massively questioned whether Plank really is alive or not due to the various implications of Plank moving, such as the scene in "Gimme Gimme Never Ed." In the episode, Eddy seems to dislike him for hurting him in various ways. Plank is somehow enrolled in Peach Creek Jr. High and plays on the football team, along with participating in the annual school spelling bee, which he failed for not speaking. Plank is almost always seen with Jonny. The two are near-inseperable and do everything together. For example, when Jonny became Captain Melonhead in the episode "Robbin' Ed," Plank became Splinter the Wonderwood, Jonny's sidekick, in the same episode. Plank is implied by Jonny to be a bit of a prankster and a wiseguy, and seems to be the cause of most of his troublesome predicaments. Jonny had become so engrossed in the world of his best friend, that he even created parents and friends for Plank out of other pieces of wood laying around.
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http://ed.wikia.com/wiki/Plank
