Marvel's Agents of S.H.I.E.L.D has been picked-up for a full 22 episode first season.

The drama, which is a spin-off of the Avengers Assemble film, has been extended from its initial 13-parts to 22 sixty minute episodes.

The show, which is currently airing on RTÉ Two at Sunday nights at 8pm, has performed so well in the US that the ABC Network has extended its first series run.

The show, which stars Clark Gregg and Ming-Na Wen, is being executive produced by Joss Whedon.