Rob (The Chromosome Connection)

Rob was a friend of Heather McCrimmon and a very close friend of Suze. Rob went along with Suze and Heather McCrimmon when they investigated strange sounds underneath the city of London but it all became too much for Rob and Suze as they ran fearing the sounds leading to Heather's meeting of the Doctor. (DWAM: The Chromosome Connection)

Reuniting
Rob and Heather were reunited when Heather returned to Edinburgh keen to catch up on old friends but Rob was too busy with university to spend time with her. (DWAM: The Genius Trap)

Rob and Heather were reunited once again when Heather and the Doctor returned to save earth from the Seebees. (DWAM: The Guardian of Murcher)