Author: Gwenno Hughes.

Series: Parc Glan Gwil.

It's Sioned Siop's birthday today. But after Dion Diogelwch forgot to organise a party last year, Sioned Siop tells him she's too busy to celebrate this year. Is it too late for Dion Diogelwch and the Parc Glan Gwil crew to pull together the perfect surprise party for Sioned Siop? Who will sort the food and decorations? What about the presents?

Awdur: Gwenno Hughes.

Cyfres: Parc Glan Gwil.

Mae Sioned Siop yn cael ei phen-blwydd heddiw. Ond ar ôl i Dion Diogelwch anghofio trefnu parti llynedd, mae Sioned Siop yn esgus bod yn rhy brysur i ddathlu. Ydy hi'n rhy hwyr i Dion Diogelwch a chriw Parc Glan Gwil dechrau trefnu parti syrpreis i Sioned Siop? Pwy fydd yn sortio'r addurniadau a'r bwyd? A beth am yr anrhegion?