starlet Hayden Panettiere -- a.k.a. "Heroes" cheerleader -- went off to make "Fireflies in the Garden" with Julia Roberts, Ryan Reynolds, Emily Watson, Ioan Gruffudd, Willem Dafoe and Carrie-Ann Moss after wrapping production of the NBC hit series this year. Taking on the film, about a family struggling to cope with a devastating tragedy, meant she had to table plans to make a feature with her younger brother, Jansen, this summer. Now he tells us it's on again.

Hayden Panettiere Moves from "Heroes" to Big Screen

"We were actually planning to do a project called 'Play Room,'" notes the 13-year-old Jansen, who stars in Nickelodeon's TV movie "The Last Day of Summer" airing July 20. "Now we're going to probably do it around next May."

Jansen -- who co-starred with Hayden in the 2004 Disney Channel Original Movie "Tiger Cruise" with Bill Pullman -- says "Play Room" is about "a dysfunctional family. We play brother and sister, and what they do is go up to the play room and tell stories to each other to try to get as far away from their life as they can."

In "The Last Day of Summer," Jansen plays tween-aged Luke Malloy, who's dreading going to middle school so much he wishes Labor Day would last forever -- and gets his wish. Now in the 10th grade in real life, Jansen says playing the part brought back his own fears of going to middle school. "I didn't get as scared as Luke, but I had butterflies and was a little nervous. Everyone tells you, 'Oh, it's horrible, you get so much work, you get teachers from the Black Lagoon …' I've already been through that, so I knew what it was like."