Dragon Ball Episode 53: Blue, Black, and Blue
Episode 53 of 153 of Dragon Ball, aired March 4, 1987, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Goku and Blue start fighting and Goku is winning till Blue powers up. Meanwhile the whole ceiling is collapsing. He is just about to kill Goku when a mouse scares him.Goku gets up and beats Blue. Bulma and Krillin want to get out before the ceiling falls but Goku wants to find the dragon ball. Once he gets it, he picks the mouse that saved him and runs, but Bulma and Krillin are about to leave.