DURING CLB STRONG ODOR IN CABIN; WITH NO WARNING INDICATIONS. ACFT RETURNED TO DEP ARPT AND DURING TAXI IN; IT WAS NOTICED THAT THE #2 GENERATOR WAS '0' VOLTS AND FREQS. NO WARNING LIGHTS ILLUMINATED AT ANY TIME. OVERWT LNDG MADE.

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ON CLBOUT; PASSING FL220; IMMEDIATELY AFTER CAPT OXYGEN MASK HAD BEEN RESTOWED IN STOWAGE COMPARTMENT; CAPT NOTICED A STRONG ODOR. MASK WAS THEN REMOVED FROM COMPARTMENT. SHORTLY AFTER; THE FO ALSO NOTICED THE STRANGE SMELL; THE FLT ATTENDANTS WERE CONTACTED TO INQUIRE IF THEY SMELLED ANYTHING OR WERE AWARE OF THE ORIGIN OF THE SMELL. THE 'A' FLT ATTENDANT RPTED THAT SHE AND THE REST OF THE CREW SMELLED SOMETHING LIKE 'SULFUR OR MAYBE AIRCONDITIONING' BUT NOTICED NO SMOKE IN CABIN. 'A' FLT ATTENDANT RPTED SMELL STRONGEST IN L SIDE OF COCKPIT. SMELL SUBSIDED AFTER 4-5 MIN. CHKS OF CIRCUIT BREAKERS; ELECTRIC SYS; AND AIR-CONDITIONING SYS REVEALED NO ABNORMALITY. ACFT RETURNED TO BWI TO HAVE MAINT INVESTIGATE ORIGIN OF SMELL. ON TAXI IN TO GATE; APU GENERATOR WAS PLACED ON BUS WHEN CAPT NOTICED #2 GENERATOR OFF BUS (BLUE LIGHT) FAILED TO ILLUMINATE. #2 GENERATOR VOLTS AND FREQS WERE '0.' NO MASTER CAUTION/WARNING LIGHTS ILLUMINATED AT ANY TIME. AN OVERWT LNDG WAS MADE AND LOGBOOK ENTRY NOTED FOR 1) UNIDENTED ABNORMAL ODOR; 2) FAILURE OF #2 GENERATOR; 3) OVERWT LNDG.