DC9 FLC HAS ZERO FLAPS WHEN EXTENDED FOR APCH. GEAR RPTED DOWN. GEAR COLLAPSES ON TOUCHDOWN; ACFT SLIDES OFF END OF RWY.

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INTERCEPTED THE GS AT 4000 FT; CLRED FOR THE LOC AND 2000 FT; THEN FOR THE APCH. REQUESTED THE APCH CHK. ATC ASKED US TO MAINTAIN 190 KTS TO THE MARKER; WHICH WE DID. STARTED TO CONFIGURE ACFT FOR LNDG WITH SLATS EXTENDED AND 5 DEG FLAPS. PREPARED FOR LNDG GEAR DOWN BY REQUESTING 15 DEG FLAPS. I CHKED THE GAUGE TO VERIFY 15 DEG FLAPS; SAW THE FLAP GAUGE READING ZERO; POINTED THIS OUT TO THE CAPT AND SUGGESTED WE 'TAKE IT AROUND.' THE CAPT OPTED TO CONTINUE THE APCH; SO I REQUESTED GEAR DOWN; LNDG CHK; FLAPS 25 DEGS WITH GREEN GEAR LIGHTS. THE CAPT RPTED THE GEAR DOWN. I CHKED THE FLAP GAUGE FOR 25 DEG FLAPS; STILL SAW ZERO; AND TOLD THE CAPT WE HAVE NO FLAPS. THE CAPT ELECTED TO CONTINUE SO I REQUESTED FLAPS 40 DEGS AND FLAPS 50 DEGS; NEITHER OF WHICH WERE ACHIEVED. WE WERE NOT SLOWING AND I TOLD THE CAPT THIS. I WAS INCREASINGLY UNCOMFORTABLE WITH THE LNDG AND ASKED THE CAPT IF HE WOULD LIKE TO MAKE THE LNDG. HE REPLIED IN THE AFFIRMATIVE AND HE TOOK ACFT CTL AND MADE THE LNDG. THE LNDG GEAR DID NOT FUNCTION PROPERLY AND THE ACFT LEFT THE RWY. SUPPLEMENTAL INFO FROM ACN 328595: AT THAT TIME THE FO MADE A COMMENT ABOUT THE FLAPS NOT RESPONDING. I LOOKED AT THE FLAP HANDLE -- IT WAS AT 15 DEGS. I LOWERED THE GEAR HANDLE AND WENT FLAPS 25 DEGS; ALSO BEGAN THE LNDG CHKLIST. FO REQUESTED FLAP 40 THROUGH 50 DEGS. AGAIN INDICATED THAT HE FELT THE FLAPS WERE NOT RESPONDING AND ASKED IF I WANTED TO GAR. I LOOKED AT THE GEAR HANDLE -- IT WAS DOWN. I LOOKED AT THE FLAP HANDLE -- IT WAS IN THE PROPER POS. KNOWING I HAD FLAPS AND GEAR AND 10000 FT OF RWY I THOUGHT WE WERE OK. THE FO; STILL FEELING UNCOMFORTABLE WITH THE APCH; RELINQUISHED THE CTL OF THE ACFT TO ME. BEING SOMEWHAT HIGH I INCREASED THE RATE OF DSCNT. BEING DAY VFR AND WITH 10000 FT OF RWY I FELT COMFORTABLE THAT I COULD TOUCH DOWN IN THE TOUCHDOWN ZONE WITH NO PROB. AFTER TOUCHDOWN; JUST AS I WENT TO ADD REVERSE THRUST; THE BOTTOM FELL OUT. THE GEAR APPARENTLY COLLAPSED. WE SLID DOWN THE RWY GOING INTO THE GRASS AT THE END OF THE RWY. A NORMAL EVAC WAS ACCOMPLISHED; NO INJURIES RPTED.