Few shows, surely, are feeling the pressure as much as Heroes as it enters its fourth season. In the past year, we've seen The Sarah Connor Chronicles, My Name Is Earl and Pushing Daisies, amongst others, get canned, while Heroes has somehow managed to keep going. This is in spite of reviews for season two and three of the show that have bordered on unfriendly, and a pervading feeling that Heroes has lost its way massively since its excellent opening season.

Heroes season four is, therefore, make or break time for the show, and already it's not been helped by the news that Bryan Fuller has left the show for a second time. Many people were hanging on to the fact that Fuller was returning - it was he, after all, who scribed many of the show's best episodes - as the best chance Heroes had.

Fuller had enjoyed some influence over the shape of season four before he moved on, of course, and the full trailer for what's the fifth volume of the show, Redemption, has now been made available. It shows us an awful lot of Prison Break veteran Robert Knepper, who it's now been confirmed will be a regular character on the show rather than in it for the originally planned six episode run. It also plays a little on what we guess is what the producers believe is season four's marketing trump card, namely Claire Bennett going to college. The lesbian storyline is not far behind.

Here's the new trailer, anyway, and the new season premieres in September. Here's hoping that Heroes can finally pull itself out of the rut that it's firmly found itself in...