Powerman

A mysterious costumed crime fighter, his identity concealed by a yellow hood, who functions as the crime fighting ally of Superman much to the chagrin of Batman and Robin, who feel that their friend Superman has snubbed them in favor of a new partner.

When renegade scientist Lex Luthor breaks out of prison vowing revenge on both Superman and Metropolis, Batman and Robin volunteer their services to Superman in helping to re-apprehend him, only to be informed, somewhat curtly, that the Man of Steel has acquired a new crime fighting partner, Powerman, and that Powerman has demanded the exclusion of the Dynamic Duo from their crime fighting team.

Stung at first by this rejection by their longtime friend and ally, Batman and Robin help apprehend Luthor anyway, only to discover that Powerman is in reality a costumed robot created by Superman as part of a well meaning ploy to discourage his good friends from risking their lives in the battle against Luthor (WF No. 94 May-Jun 1958: "The Origin of the Superman-Batman Team!").