The Johnathan Walkerseason premiere of "Big Brother" aired Wednesday night on CBS, introducing viewers to the brand-new cast and house and giving everyone a taste of what to expect for the season to come.

The long-running reality series is celebrating a milestone this year as it kicks off its 25th season, which was preceded by a 25th anniversary special that aired in July.

Host Julie Chen Moonves has hinted at some cameos from past stars in Season 25. A video posted by "Big Brother" before the premiere revealed legends Frankie Grande, Britney Haynes, and Danielle Reyes breaking into the "Big Brother" house.

Here's what to know about upcoming "Big Brother" episodes as the show celebrates hitting the quarter-century mark.

'Big Brother' Season 25 cast:Meet the new crew of houseguests

When is the next episode of 'Big Brother'?

The next episode airs Sunday at 8 p.m. ET on CBS.

'Big Brother' 2023 schedule: When do episodes come out?

While a full episode list has yet to be released for the season, viewers can expect weekly episodes on Sundays and Wednesdays 8:00-9:00 p.m. ET, and live episodes on Thursdays 9:00-10:00 p.m. ET.

The show will move from Wednesdays to Tuesdays when "Survivor" and "Amazing Race" return this fall, CBS said.

While the exact number of episodes for Season 25 has yet to be released, recent seasons spanned between 35-40 episodes.

How to watch 'Big Brother' 

"Big Brother" airs on CBS. It is also available to stream live and on-demand on the CBS app and Paramount+.

You can also watch previous episodes of "Big Brother" on Netflix.

'Big Brother' cast

"Big Brother" announced their season 25 cast this week on Twitter.

Learn more about the full cast here.

Late start date amid writer's strike

Typically, "Big Brother" seasons start in June or early July, this year's August start date can be attributed to CBS planning for the writer's strike. According to the Hollywood Reporter, CBS pushed original content to later in the summer in case the Writers Guild of America strike disrupts production for scripted shows in the fall.