The answer is given in Zeta Altman. The super beast in this episode is called Barabba, which is manipulated by Yapool's feud. Zeta Altman is no match at all.
At the critical moment, Aesop Altman appeared. The two men finally defeated Barabba through fierce fighting. At last, Ace explained their relationship.
It turns out that the name "Zeta" was taken by Aesop Altman, which has the ultimate meaning in the language of the earth people, which further explains the title of this episode.
If only from the naming behavior, Ace can be regarded as Zeta's father, but in fact, their relationship is still junior, because Zeta has always called Ace his brother.
Extended data
The 40th anniversary of Eddie Altman is the return of Ace.
For Otto's fans, this year coincides with the 40th anniversary of Eddie Altman. Generally speaking, Eddie Altman should appear in memory of Yuangu. However, in Zeta Altman's plot, it is not Eddie who is waiting, but Essotman. If this is not Round Valley's preference, it may indicate that Aesottman will promote the plot.