Alperton and Loughton are the only ones to contain a heavy weight (ton), but I don't see a cartoon character there. To help others, I have listed below all the Underground stations that are 8 letters long or start with a word of 8 letters: Alperton Amersham Barbican Chalfont Chancery Chigwell Chiswick Colliers Dagenham Deptford Eastcote Elephant Elverson Finchley Finsbury Gallions Goldhawk Hainault Heathrow Highbury Highgate Holloway Hounslow Ickenham Ladbroke Lewisham Loughton Monument Moorgate Mudchute Northolt Osterley Perivale Plaistow Richmond Shadwell Stamford Stanmore Turnpike Uxbridge Vauxhall
It can't be Elephant as the proper name for the station is Elephant and castle, which I already have in another clue,
I have googled Goldhawk and it seems quite a tenuous link. I will keep working on it, this is the last one.
Thanks everyone.