Mels (River Song)

Mels was an incarnation of River Song, she appeard in Let's Kill Hitler and TEAM TARDIS series 2

Adventures with the Eleventh Doctor
At some point River, who at the time went by the name of Mels and was unaware of her future name, River Song, met Amy, Rory and the Doctor in a corn field. Although she had been a friend of Amy and Rory during their childhood, she never told them that she was their daughter and manipulated them into taking her to the Doctor. Being on the run from the law at the time, Mels forced the Doctor to take her away in the TARDIS and they met Adolf Hitler. Mels was shot by Hitler but regenerated. (DW: Let's Kill Hitler)

She re-appeard in the TARDIS as she was teliported from Berlin after. Andrew had never met her yet (TT: Protron Rebirth)