ACR MLG PHYSICALLY LOST AN ENG ON TKOF FROM DFW. FLC ADVISED THEY WANTED TO RETURN AND WERE VECTORED BACK FOR AN APCH TO RWY 13R.

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MLG WAS CLRED FOR TKOF ON RWY 18L. IMMEDIATELY AFTER ROTATION I OBSERVED A HUGE BALL OF FLAME AND DARK SMOKE FALL AND TRAIL BEHIND THE MLG AS HE PASSED DIRECTLY IN FRONT OF THE TWR. I REFRAINED FROM XMITTING ANYTHING UNTIL I OBSERVED MLG IN LEVEL CTLED FLT. AT THAT POINT I ASKED HIS INTENTIONS. HE REPLIED 'MAKE A R TURN AND COME BACK AROUND TO LAND ON RWY 18R.' AS MLG TURNED DOWNWIND HIS RADAR TARGET DISAPPEARED IN THE MAIN BANG OF THE ANTENNAE AND HIM HAVING CLBED INTO THE CLOUDS WAS NO LONGER IN VISUAL CONTACT. ARRS ON RWY 13R WERE BEING SENT AROUND. WE DECIDED TO CLOSE THE ENTIRE W SIDE OF THE ARPT. I BEGAN GETTING PREVIOUSLY ARR ACFT FROM BTWN THE RWYS AND ON THE TAXIWAYS AWAY FROM RWY 18R. I HAD NO IDEA HOW MUCH CTL OF THE ACFT THE PLT HAD AND FEARED UPON LNDG HE MAY MISS THE ACTUAL RWY. I REESTABLISHED HIS TARGET 1 MI W OF THE NUMBERS OF RWY 18R AND TRACKING ABOUT 010 DEGS. 2 ACFT ON FINAL TO RWY 18R WERE SENT AROUND TO ENABLE MLG TO LAND. I ASKED HIM IF HE COULD MAKE A R TURN BACK INTO THE ARPT AND HE REPLIED HE WANTED TO BE VECTORED OUT FOR AN APCH. I ASKED HIS ALT AND ISSUED A L TURN AWAY FROM THE FINAL OF RWY 17L. HE RESPONDED LEVELING AT 3000 FT. AT THIS POINT MLG AND ACR Y WERE NEAR THE SAME ALT AND WITHIN APPROX 1 MI HORIZ OF EACH OTHER. WHEN MLG WAS CLR OF MY TFC AND ESTABLISHED ON A 310 DEG HDG I SWITCHED HIM TO DEP. THROUGHOUT THE TIME I WAS TALKING TO MLG HIS ARTS TAG HAD BEEN SUSPENDED BY THE DEP CTLR AND I HAD NEITHER A CALL SIGN NOR ALT READOUT TO WORK WITH. MLG WAS VECTORED AND COMPLETED AN ILS RWY 13R APCH WITHOUT INCIDENT. SUPPLEMENTAL INFO FROM ACN 199058: MLG MADE A VISUAL APCH TO 13R. MLG MAY HAVE GOT TOO CLOSE TO SOME AIRPLANES ON THE 18R/17L FINAL; BUT THE PLT OBVIOUSLY WAS EXERCISING HIS EMER AUTHORITY; SO ALL IS FAIR. BIG SKY THEORY. I AM CONVINCED THAT IF THE CREW OF MLG KNEW ABOUT THE ATC SYS OF DFW THEY MAY HAVE THOUGHT TWICE BEFORE THEY TURNED HARD R.