from variety.com:
“Supernatural” fans are going to have to wait a while longer to find out how the show ends.
Neither “Supernatural,” nor “The Flash,” nor “Legacies” will be able to finish their current seasons in the time frame that was originally planned. All three CW series were among hundreds that were forced to shutdown production due to coronavirus, meaning that they were unable complete shooting and their season endings have now been pushed to an undetermined time later in 2020, according to a source close to the network.
“Supernatural” co-showrunner Andrew Dabb explained on Twitter earlier this week that the show had filmed through episode 18 of its fifteenth and final season, but that its “visual effects and sound departments have closed because of the outbreak. So, right now, the episodes can’t be finished.” Starting March 30, episodes of “Supernatural” will be replaced by an original episode of “Whose Line Is It Anyway” in the 8 p.m. time slot, followed by a replay of the improv comedy show from 8:30 until 9 p.m.