[6] He later developed and wrote for The WB's 2003 television series Tarzan, which was cancelled after eight episodes,[3] and followed this by writing the 2005 film Boogeyman.

[9] Prior to his success with Supernatural, Kripke co-wrote the screenplay for the film Boogeyman, which was released in early 2005.

During the series, it was in 2008 that he signed an overall deal with Warner Bros.[12] After Kripke stepped down as primary showrunner for Supernatural following the show's fifth season, he began developing other projects.

It stars Billy Burke, Tracy Spiridakos, David Lyons, Giancarlo Esposito, Elizabeth Mitchell, Graham Rogers and Anna Lise Phillips co-starring.

Concurrently, a TV adaptation was being developed for USA Network, with Kripke serving as both the writer and executive producer.

[18] In August 2015, it was announced that Kripke, along with fellow writer Shawn Ryan, were developing an action-adventure show, Timeless, for NBC.

Described as "Back to the Future meets Mission: Impossible", Timeless is about an unlikely trio traveling through time to battle unknown criminals in order to protect history.

Kripke was set to write the series while Goldberg and Rogen were set to direct, with Kripke, Goldberg, Rogen, Neal H. Moritz, Pavun Shetty, Ori Marmur, James Weaver, Ken Levin and Jason Netter serving as executive producers.