The Big Bang Theory season 8 pre-finale episode airs on 30 April at 8pm on CBS Network.
Episode 23 is titled The Maternal Combustion, where Sheldon and Leonard's mothers come to visit them.
11:32 Mark Hamill, Lena Headey lend voices to 'Trollhunters' characters19
22:17 Gal Gadot, Kumail Nanjiani, Ryan Gosling first hosts for new ‘Saturday Night Live’ season19
22:35 Sam Waterston to return to ‘Law & Order’ in ‘SVU’ guest role21
19:37 Texans' Will Fuller won't play against Patriots21