Sorry it's Been Such a Long Time, Niko-chan (ごぶさたニコチャン Gobusata nikochan) is the 177th episode of Dr. Slump Arale-chan.
Synopsis[]
King Nikochan is telling his two sons about his fake heroic story on Earth. So now they wanting to go to the Earth, but he ignores it. However, his wife tells him to take the kids to the Earth, so King Nikochan has to go back to the Earth with them.