MULTIPLE PLT AND FLT ATTENDANT RPT; S80; DFW-ORD; AFTER TKOF; CABIN SMOKE AND FUMES; RETURN TO DFW. FLT CANCELED.

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UPON TKOF; THE CABIN FILLED UP WITH FUMES. I NOTIFIED THE CAPT. HE TOLD ME TO CHK THE CABIN AND RPT BACK TO HIM. THE SMELL SEEMED TO DISSIPATE; THEN IT CAME BACK EVEN STRONGER. THE ODOR FILLED THE ENTIRE PLANE; NOT JUST IN ONE SPECIFIC AREA. I NOTIFIED THE CAPT AND INFORMED US THAT WE WERE LNDG BACK IN DFW. UPON LNDG; THE ACFT WAS MET BY FIRE TRUCKS AND AMBULANCES. AFTER THE EXTERIOR OF THE PLANE WAS CHKED; WE PROCEEDED TO THE JETBRIDGE AND DEPLANED THE PAX. I BELIEVE THIS EMER WAS HANDLED VERY PROFESSIONALLY AND EFFECTIVELY. THE ONLY THING THAT I QUESTIONED WAS THE AGENTS' (WHO MET THE ACFT) RELUCTANCE TO GET THE PAX OFF THE ACFT IMMEDIATELY. THE CAPT; AS WELL AS OTHER OFFICIALS; BELIEVED WE SHOULD GET THEM OFF. THE AGENTS HESITATED AND WANTED TO AVOID TAKING THE PAX OFF. IT SEEMED TO ME; THAT THEY DID NOT WANT THE 'HASSLE.' TO ME; THE MOST IMPORTANT THING WAS TO TAKE CARE OF AND ACCOMMODATE OUR PAX. HAVING SPENT 20-30 MINS BREATHING TOXIC FUMES; I SAY 'GET THEM OFF.' THE AGENTS DID NOT CONSIDER THIS. SUPPLEMENTAL INFO FROM ACN 445159: 70 MI NE OF DFW AT FL235 WE RETURNED DUE TO FUMES RPTED IN THE CABIN BY THE FLT ATTENDANTS. SUBMITTING A DETAILED RPT OF THE DIVERSION; MAINT DETERMINED THE HYD XFER PUMP FAILED AND SPRAYED HYD FLUID ON ONE OF THE PACKS CAUSING THE FUMES.