Doncaster Rovers and Wolves will have to do it all again after sharing four goals at the Keepmoat Stadium.
Wolves took the lead through Nenad Milijas on 38 minutes when he gave Sullivan no chance with a long-range screamer.
Rovers came straight back and went into the interval in the lead with two goals in two minutes.
Billy Sharp scored the equaliser on 41 minutes when his low shot from the edge of the area found the bottom corner.
James Hayter made it 2-1 on 43 minutes when Oster headed into the path of Hayter and he gave Hahnemann no chance.
Wolves got back on level terms on 57 minutes from the penalty spot.
Sam Hird was adjudged to have fouled Milijas and Steve Hunt beat Sullivan from the spot.
Wolves were reduced to ten men with 13 minutes remaining when Elokobi was sent off for an aerial challenge on James Coppinger that left him needing lengthy treatment.
The replay will take place at Molineux on Tuesday January 18th with a 7.45pm kick off.
Sullivan, Chambers (Friend 64), Lockwood, O`Connor, Hird, Mills, Wilson, Oster, Sharp, Hayter (Brooker 90), Coppinger
Subs not used
G. Woods, M. Woods, Webster, Fairhurst
Hahnemann, Doherty, Stearman, Berra, Elokobi, Jarvis, Edwards (Jones 27), Milijas, Hunt, Ward, Fletcher (Doyle 69)
Subs not used
Hennessey, Davis, Winwall, Muganji-Bia, Batth
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