Administrators at Memory Alpha have the following privileges and responsibilities: * Protecting pages. Admins can protect pages from further changes in cases of vandalism or content disputes. This should happen only in certain rare circumstances (see also: Protection policy). * Deletion and undeletion. Admins can delete and un-delete pages and images from Memory Alpha. This happens more frequently, but it is necessary to restrict permissions to this feature in order to prevent vandalism (see also: Deletion policy). * Block and unblock. In extreme cases, admins can ban users from contributing to Memory Alpha, either for a specific amount of time, or indefinitely (see also: Bans and blocks). * MediaWiki namespace. Admins may edit the protected pages in the MediaWiki namespace.