United Kingdom, Jan. 30 -- Caitlyn Jenner's appearance on her son Brandon's new reality show was scrapped after she reportedly threatened legal action.

The 74-year-old television personality - who was Olympian Bruce Jenner before transitioning - was set to show up in an episode of UnchainedTV's 'At Home With the Jenners', however, she feared being seen on another network's programme would compromise her Fox News job as an on-air contributor.

Sources told TMZ: "Caitlyn had no idea she was going to be part of Brandon's show whatsoever, and she wasn't happy when she found out he was using her for promotions, let alone when she found out she was actually in a scene."

The former 'Keeping Up with the Kardashians' star got her lawyers to warn...