Rt28

[redglenys]

3dkirk seen with martians he will destroy [7,7]
8d placing a catholic upon a breakfast cereal [4,2,8]
7a primate knowing outlet is doubly interrupted [10]
18a show the way to transport sitcom[4,7]
12a asian hit with a shield again [11]
sorry no letters
struggling today

[scorpiojo]

7a Archbishop?

[Calibax]

8d Pain au Chocolat (not really a cereal though)

[bibblebub]

3d: William Shatner [anagram]

[Lie-in King]

3d William Shatner - anag 'Martians he will'
8d Pain au chocolat - anag 'a catholic upon a'
7a Archbishop - 'bi' (doubly, in) 'arch' (knowing) + 'shop' (outlet)
18a Lead Balloon
12a Bangladeshi - 'bang' (hit) + anag 'a shield'

[bibblebub]

7a: ARCHBISHOP = primate

knowing= ARCH, outlet = SHOP, doubly = BIS

arch bis shop

[Calibax]

18a Lead Balloon

[redglenys]

thank you all

[CarylB]

3d anag Martians he will William Shatner
8d Pain au chocolat
12a Hit = bang then anag a shield Bangladeshi