Plot summary
After being reminded of ruining Dodge's Career Day a few years earlier, Earl agrees to appear again. Awkward questions remind Earl that Dodge doesn't know that Earl isn't his natural father. Under pressure, Joy reveals that Little Chubby – the richest businessman in Camden – is Dodge's real dad. Earl tries to get Little Chubby to do his duty to Dodge; Little Chubby responds to Earl's efforts by freezing his bank account and having him evicted from the motel. Eventually a DNA test reveals that Dodge's father is not Little Chubby but Earl himself: the conception occurred during a Halloween party, at which Earl and Little Chubby wore similar costumes. Even more surprising is that Darnell isn't Earl Jr's father, meaning Joy previously had another affair.
Credits
Adapted from Wikipedia contributors, My Name Is Earl season 4. HTML formatting and reference markers removed.