With Wonderman off limits during the lawsuit, Fox turned to Blue Beetle as his company's cornerstone character. The book sold reasonably well, and in the tail end of 1939, Fox decided to try to emulate Superman's media saturation by putting Beetle into his own comic strip. He began putting out ads to this effect in November of that year.
The Blue Beetle strip debuted in The Boston Evening Transcript on January 8, 1940. As far as anyone's been able to actually prove, that's the only paper it ever actually ran in. Kirby seemed to be largely left to his own devices with the strip. Aside from the Blue Beetle himself, Kirby seemed to be using his own cast of characters. Even with little continuity established in the comic book at this point, Kirby seemed unconcerned that it even existed.
While it's not Kirby's best art, he was more already more adept than most others at the storytelling of a daily strip. In the few sequences I've seen, he's able to run one installment to the next without either clumsily recapping what happened previously or letting readers get lost. Much like how he handled his Sky Masters strip decades later.
Fox continued trying to hype Blue Beetle, getting him his own radio show by May 1940 and hosting a "Blue Beetle Day" at the World's Fair in August. That radio program only lasted until September, though, and comic strip died out at the year's end. He never became the media sensation that Superman was. One wonders, though, what might have become of the character had Kirby never met Simon and continued on the strip.
While we're talking Kirby, this would have been his 98th birthday. Several years ago, his granddaughter Jillian started a Kirby 4 Heroes campaign that she runs every August to help raise money for the Hero Initiative. So please take a moment to head over to the Kirby 4 Heroes site and donate what you can to help comic creators in need.