Crossword clues for part of this puzzle's themeAnswerClueJUMPSOVERPuzzle theme, part 3CLUESPart of this puzzles' themeDARKESTTIMELINEAlternate universe in which things are extremely bad, and a hint to the hidden parts of this puzzle's themeBUNSHamburger parts, or this puzzle's theme?SQUARESPart of this puzzle's themeZAMBIAUnited Nations member since 1964 (but not part of this puzzle's theme)SONSSome relatives (not, strictly speaking, part of the puzzle's theme)DROPDOWNLike some menus, and what parts of this puzzle's theme answers doTWOSTheme of the puzzle, in partSCHISMRift ... or, read in three parts, a description of this puzzle's themeOPERATIONClassic kids' game involving removal of body parts ... with a hint to this puzzle's themeGEARSHIFTAutomotive part ... and a hint to this puzzle's themeIBEFOREEPart of a spelling rule, and a hint to this puzzle's themeBLINDCARBONCOPYWith 74- & 75-Across, "invisible" part of a distribution list ... or a hint to this puzzle's themeTUESDAYPart of a calendar septet, and a phonetic hint to this puzzle's themeMUSICALSCALEParts of it appear at both the starts and ends of this puzzle's eight theme phrasesPLAYHORSETake part in an add-a-letter basketball game, as demonstrated by this puzzle's theme answersTHEParts 1 and 4 of this puzzle's theme