The 26-year-old centre-back joined Scottish Premiership club Dundee as a free agent last week and was thrown straight into the starting lineup for a trip to Rugby Park to take on Kilmarnock.
The towering defender, who's well known to football fans across England, rose highest to Roarie Deacon's near-post corner before firing his header into the net.
Even though Caulker's fine goal gave Dundee a 2-1 lead in the 56th minute, Kilmarnock fought back as strikes from Kris Boyd and Iain Wilson condemned the visitors to their third loss in a row in all competitions.
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