CAPT OF A L1011 OVERSHOT DSCNT XING RESTR ALT AND MADE SUCH AN ABRUPT CORRECTION THAT 2 FLT ATTENDANTS WERE INJURED. IN ADDITION; SINCE THE WRONG WAYPOINT HAD BEEN ENTERED INTO THE FMC; RPTR WAS NOT ON THE PRESCRIBED STAR ARR TRACK.

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ACFT WAS CLRED TO LOGEN INTXN WHEN FO WAS ABSENT FROM COCKPIT FOR PERSONAL BIOLOGICAL REASONS. ACFT WAS LEVEL AT FL240. FO RETURNED TO COCKPIT AND WAS INFORMED OF CLRNC DIRECT TO LOGEN. UPON INSPECTION OF LATITUDE/LONGITUDE OF WAYPOINT THAT ACFT WAS PROCEEDING TO; DETERMINED WRONG WAYPOINT SELECTED. AT THAT TIME; ATC ISSUED DSCNT TO FL200. ALT SET; AND ANNUNCIATED; IN ALT SELECTOR. FO COMMENCED VERIFYING AND INPUTTING PROPER WAYPOINT LATITUDE/LONGITUDE. AT FL210; THE REQUIRED '1000 FT TO GO; OUT OF FL210 FOR FL200' WAS MADE BY THE FO AND 'ROGERED' BY THE CAPT. BEFORE THE FINALIZATION OF THE CORRECT WAYPOINT WAS COMPLETED; A RADICAL PULL-UP WAS INITIATED BY THE CAPT. WHEN QUESTIONED WHY; THE CAPT STATED THAT THE ACFT AUTOPLT FAILED TO CAPTURE THE SET ALT; FL200. THE ACFT DSNDED BELOW FL200 BY 400-450 FT BEFORE RETURNING TO THE CLRED ALT. FOR UNKNOWN REASONS; THE ACFT DID NOT LEVEL OFF. AFTER; THE ACFT WAS LEVELED OFF MANUALLY; (THE AUTOPLT WAS DISCONNECTED BY CAPT DURING HIS ATTEMPT TO RE-LEVEL THE ACFT) AND THE ALT SET KNOB WAS RESET TO FL200. 2 FLT ATTENDANTS WERE SHAKEN UP AND SUSTAINED MINOR INJURIES THAT WERE BROUGHT TO THE ATTN OF THE FLC WITHIN 10 MINS OF THE INCIDENT. NO ATC COMMENTS WERE MADE ABOUT ALT BUST.