Author: Anne Fine; Welsh Adaptation: Gordon Jones.

Series: Cyfres Pwsi Beryglus: 1.

Poor Elin is horrified when Twffyn drags a dead bird into the house. Then a mouse. But Twffyn can't understand what all the fuss is about. Who on earth will be the next victim to arrive through the cat-flap? Can soft-hearted Elin manage to get her beloved pet to change his wild, wild ways before he ends up in even deeper trouble? An adaptation of Diary of a Killer Cat.

Awdur: Anne Fine; Addasiad Cymraeg: Gordon Jones.

Cyfres: Cyfres Pwsi Beryglus: 1.

Mae Elin, druan, yn cael braw pan mae Twffyn yn llusgo aderyn wedi marw i mewn i'r tŷ. Wedyn llygoedn. All Twffyn ddim deall pam mae cymaint o halibalŵ. Beth, tybed, fydd y creadur nesaf i ddod i mewn drwy'r fflap cath? A fydd Elin yn llwyddo i newid natur wyllt ei hannwyl gath cyn i'r bwsi beryglus greu helynt gwaeth o lawer? Addasiad o Diary of a Killer Cat.