Unnamed planets from year one title sequence. The red planet seems to be Terra Nova from Matter Of Life and Death.
Unnamed planets from end credits and year two title sequence. The end credits show the Moon, in different colours, with small planets visible beyond.
Unnamed chlorine planet, with underground chambers (The A B Chrysalis)
Chlorine planet moon
Unnamed planet (War Games)
Unnamed planet (The Immunity Syndrome)
Unnamed planet (All That Glisters)