Tennis Ball was working on Golf Ball's underground lab, doing some experiments, and working on new inventions.

He always dreamed to be the best inventor! Just like his best friend Golf Ball, he was working pretty hard until he heard some footsteps. He wasn't expecting guests today.

He left his work on the table and walked towards where the sound was coming

〔 TENNIS BALL:"Who's.. there ?? This is private property ! I think so- ? B-but seriously, who's there !" 〕