Upcoming episodes, programme details and where to watch over the next seven days. All times are UK time.
Tra mae'r Dreigiau yn chwarae, mae gan Cadi brawf pwysig i'w wneud ar y rheilffordd. While the Dragons play, Cadi has an important test to do at the railway.
Pan mae problem gyda rheiliau poeth, a all y Dreigiau eu hoeri mewn pryd? When there's a problem with hot rails, can the Dragons cool them down in time?
Yn yr iard ym Mhendre, mae Cadi'n sylweddoli ei bod wedi colli bollt bwysig. Mae angen ei ffeindio! In the Pendre yard, Cadi realises that she has lost an important bolt. She must find it!
Pan aiff Cadi ar goll, mae angen i'r dreigiau ei hachub. When Cadi goes missing, it's up to the dragons to come to her rescue.
Mae'r Dreigiau mewn picl pan fydd angen iddynt newid amserlen y rheilffordd. The Dragons get in a pickle when they need to change the railway's timetable.
Mae Cadi, y gyrrwr trên, mewn trafferth pan fydd dwy ddraig ifanc yn mynd â'i hinjan stêm am daith heb ofyn. Trouble for Cadi when young dragons take her steam engine for an unplanned trip.