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Their first meeting, shown at the end of "Doomsday" & re-shown early in "The Runaway Bride", was on 24 December (Christmas Eve) 2007. On that occasion, Donna rejected the Doctor's invitation to travel with him but, after some unsatisfactory attempts to adventure on her own, she regretted her decision & began trying to meet him again. They met again in Spring 2009, as shown in "Partners in Crime".