It was the super-crossover that never happened.

WhenBeyond the Gatesdirector Jackson Stewart called into EW RadiosEntertainment Weirdlyshow (Mondays, 1 p.m. More specifically, he mentioned one idea that they could never make work.

There was a lot of really cool ideas that some of the writers had, Stewart said.

All Crops: Supernatural/Smallville Split

Credit: Liane Hentscher/The CW; Jack Rowand/The CW

So they find out that Tom Welling fromSmallvilleis next and have to save him.

I thought that was one of the funniest ideas that Id heard.

As for Stewart, you might check out his full interview on Monday, Dec. 5 at 1 p.m.

ET on SiriusXM 105, and his film,Beyond the Gates, hits theaters and VOD Dec. 9.