Season 20 then saw the return of Omega , the Mara , the Black and White Guardians ( from the `` Key to Time `` season ) , and Brigadier Lethbridge-Stewart .
NOUN NUM ADV VERB DET NOUN ADP NOUN , DET PROPN , DET PROPN CCONJ PROPN PROPN ( ADP DET `` ADJ ADP PROPN `` NOUN ) , CCONJ PROPN PROPN .