A series of niggling injuries had meant that the Norwegian international hadn't started a game for the club since mid-December, but he played a crucial role as Rovers secured their sixth victory on the road this season.
King claimed an assist for Rovers' first goal, a clever cross that Rudy Gestede headed home. Whilst his forceful run down the flank eventually lead to Todd Kane firing home the third goal of the afternoon.
"Kingy has waited his turn and he got his opportunity now," said the Rovers boss.
"His pace has always been a threat, but we had an end product from him against Birmingham and that is what he's got to keep striving to do.
"He knows now that he has to be better than that on Saturday."
Tickets for Saturday's match against Charlton are currently on open sale, priced £30.00 Adults, £22.00 Senior Citizens aged over 60, £22.00 Under 21’s, £10.00 Under 18’s and £5.00 Under 11’s. Book online today at www.onerovers.co.uk
or call the ticket office on 0871 222 1444
. Tickets will also be available from Charlton on the day of the game from the South Stand Ticket Office.