Cheers man!
The method worked on my Galaxy S1, so here's my current line-up :
This "Episode" is kinda BS in my opinion, the bosses have such insane levels of health that, if you're not paying money for character cards &/or cubes, you basically have no chance of getting even the lowest level complete Episode Character card set; Just to get Bonecrusher's Alt mode card, I have to get a minimum of 2,000,000 points!
Evidently it's geared to be a money sink, favouring those who spend $$$ - It's bugs me because I've been playing this game since last year and this has literally provided no advantage..