Fifty-two episodes of Tatsunoko dropping a royal succession crisis, a time machine, and a giant robot into the same blender, then keeping a straight face for maybe four minutes at a stretch. The setup is fairy tale nonsense played dead serious: two houses of the Kingdom of Calendar, one throne, and a Cosmo Peacock buried somewhere in a thousand years of history, so go fetch it. What you actually get each week is a new century as a playground, a scheme that collapses on the people who cooked it up, and a last act that cashes out in mecha the show refuses to feel embarrassed about. This is 1981 comedy adventure with zero irony insurance, slapstick and sincerity sharing a screen without apologizing for either. The treasure hunt is the excuse. Watching the losers lose again, and lose bigger, is the reason you stay.

Two royal families of the Kingdom of Calendar, a thousand years in the future, fight over which of them will inherit the throne. Each house sends its heir traveling through the ages to recover the legendary Cosmo Peacock, and whoever returns with it becomes the rightful ruler. In the present day, a princess from that future turns up at a quiet detective agency and tells its two detectives that they are her distant ancestors. They agree to help her in the race against her rival. The show mixes action, adventure, comedy, fantasy and mecha elements.