Supergirl will not air a new episode on Monday, April 4.

After The Flash visited National City and became BFFs with Kara (boosting the show’s ratings by 30 percent in the process) before returning to his world and network, Supergirl is taking a week off.

Two Big Bang Theory reruns will air in instead, followed by repeats of Scorpion and NCIS: Los Angeles. Supergirl will return with a new episode on Monday, April 11 with the first of the two-part season finale, entitled “Myriad.”

Supergirl season 1, episode 18, “Worlds Finest,” featured a crossover with The Flash, as Barry Allen arrived in National City. However, he quickly realized he was on the wrong Earth and asked Kara for help returning home.

Though Kara was eager to help, she first had to deal with a team-up between the newly minted Silver Banshee (Siobhan having come into her powers and embracing being a villain) and Livewire, who Siobhan freed from the DEO. Barry stepped in to help and both rogues were defeated.

After helping Barry run fast enough to return to his own world, Kara kissed James after getting advice from Cat and Barry. However, James didn’t have a chance to respond as Non activated Myriad, a type of mind control that brought everyone affected into the streets.

The synopsis for Supergirl season 1, episode 19, “Myriad,” reads:

“Kara must find a way to free her friends when Non and Indigo use mind control to turn National City’s citizens into their own army.”

Supergirl returns Monday, April 11 at 8:00 p.m. ET on CBS.