I was wondering, why is Space Guppies a candidate for deletion? I mean, it IS an episode of the show, after all. Maybe the problem is either a lack of attention that pages recieve or that guy who keeps typing Y in some different episode pages.
Thank you for your help. All mentioned bannings and deletions have been taken care of.
The issue with locking pages is, unless there's a super-intelligent filter able to detect vandals/spammers and prevent them from editing (which is unlikely), we can't flip the switch for the entire Wikia database to be only accessible for editing by administrators. Not all registered users are vandals; some can be contributive!
However, the only effective and feasible option we could switch the Wikia to is the option of preventing IP edits, which, I believe, is already put into effect.