Arnold decides to leave the boarding house because his grandmother is mixing up Thanksgiving with the Fourth of July. Helga on the other hand leaves her house because she refuses to say anything thankful. Both Arnold and Helga try to find the true meaning of Thanksgiving. They try to watch the Mayflower re-enactment but the ship crashes onto a bridge and the fire department must rescue the re-enactors. Arnold and Helga decide to spend Thanksgiving with Mr. Simmons but his loved ones start bickering. Arnold and Helga head home, they are able to enjoy their Thanksgiving with their respective loved ones. Gertie soon begins to set off the fireworks.
