Nathan Fillion has said that a Dr Horrible sequel is still "absolutely possible".

Fillion - who played Captain Hammer in the cult online musical - told IGN that Joss Whedon's busy schedule has prevented a follow-up from going into production sooner.

Lionel Cironneau/AP

"We had designs on doing it sometime this summer, but Avengers 2 popped up," he explained.

"The upside is that everyone involved with that project still wants to do another one. No-one is getting impatient about it. I think we all have faith that we're going to do another one."

He quipped: "And we know where Joss lives. So we've got that going for us."

Dr. Horrible's Sing-Along Blog starred Neil Patrick Harris as a kind-hearted super-villain and Fillion as his nemesis.

Following its online release, the series was aired on television by The CW in October 2012.

Fillion previously told Digital Spy he was convinced that a sequel would eventually materialise, while The Big Bang Theory's Simon Helberg - who played sidekick Moist - also told DS that "everyone [involved] is excited" to start work on a follow-up.

> Dr Horrible sequel not coming soon, says Joss Whedon

Watch a clip from Dr Horrible's Sing-Along Blog below:

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