Laconic / Only the Author Can Save Them Now

A situation where Deus ex Machina is the only conceivable way for the heroes to defeat the villain.
Visit the diamond-plated 50-foot-tall unabridged version with guided missiles that can stop time HERE

http://tvtropes.org/pmwiki/pmwiki.php/Laconic/OnlyTheAuthorCanSaveThemNow