B757-200 CABIN CREW ALERTS CAPT OF SMOKE/FUMES AFTER DEP. RETURNS TO DEP ARPT.

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OUR FLT WAS LATE TO LEAVE DUE TO A MECHANICAL. AFTER ABOUT 3 TO 5 MINS FROM TKOF I SMELLED SOMETHING ELECTRICAL AND COMMUNICATED THIS TO FLT ATTENDANT #4. I CALLED THE COCKPIT AND EXPLAINED THE SMELL; AND TOLD THE CAPT THAT I WOULD CALL HIM BACK IN SECONDS IF IT GOT WORSE. AT THAT TIME; I LOOKED BACK IN THE CABIN AND PAX WERE COMPLAINING OF A BAD ODOR. I WALKED INTO THE CABIN AND THE SMELL WAS STRONGER; LIKE ELECTRICAL OR PLASTIC. I ALSO NOTICED A SMOKE OR HAZE SLOWLY FILLING UP; IN NO PARTICULAR AREA. I IMMEDIATELY CALLED BACK TO THE COCKPIT AND UPDATED THE PROGRESS AND TOLD HIM I WAS GOING TO LOCATE THE HAZE. WHEN I WAS AT MY INTERPHONE I NOTICED THAT THE FLOOR BY MY JUMPSEAT WAS GETTING VERY WARM AND AT THE SAME TIME THE SMOKE ALARM IN THE LAVS STARTED RINGING. I IMMEDIATELY WENT TO GRAB THE HALON; AND FELT THE WALLS AND CEILINGS IN BOTH LAVS. THEY FELT NORMAL. THEN ONLY THE R LAV ALARMED CONTINUED TO CHIME. THE L LAV CHIMES STOPPED. I THEN CALLED UP TO THE FRONT AND ASKED THE FLT ATTENDANTS TO BRING BACK MORE HALONS. I STARTED TO FEEL THE CEILINGS IN THE AISLES. BY THIS TIME; THE SMOKE/HAZE HAD DISSIPATED. THE CAPT INFORMED THE PAX WE WOULD BE LNDG IN 10 MINS. I THEN WENT UP THE WINDOW EXITS TO BRIEF THE PAX IF AND WHEN THEY NEEDED TO OPEN THE WINDOW. WE LANDED WITHOUT INCIDENT. I FELT SLIGHT PRESSURE IN MY EAR. I CALLED THE COCKPIT AND THEY CONFIRMED THEY WERE DEPRESSURIZING THE CABIN. WE WERE FINALLY TOWED TO THE GATE. I ASKED FLT ATTENDANT #4 IN FWD CABIN FOR ADDITIONAL HALONS. FLT ATTENDANT #1 CAME BACK WITH HALON AND MADE A PA TO PAX TO REMAIN CALM AND FOLLOW DIRECTIONS OF FLT CREW. SHE THEN WENT BACK TO FWD CABIN. HUMAN PERF CONSIDERATION: THE OTHER FLT ATTENDANTS WERE PASSIVE IN LOCATING HALONS AND SMOKE AND FOLLOWING PROCS. NO ONE DID AN EMER CHKLIST AND FLT ATTENDANTS DID NOT RE-BRIEF PAX AT WINDOW EXIT BUT I DID BEFORE LNDG.