Sgt. Frog Episode 35: The Birthday the Earth Stood Still!
Episode 35 of 358 of Sgt. Frog, aired November 27, 2004, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Natsumi's birthday rolls around this year, and Keroro has big plans for a surprise party. However, Fuyuki has doubts in this plan; not least because Natsumi told him that she thought parties were childish. So, will the party work?